Materiały źródłowe

• #1 Folliculitis: Appearance, Causes, Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/17692-folliculitis

  Folliculitis is a common skin condition thats often caused by an infected or inflamed hair follicle. […] In general, folliculitis is caused when a hair follicle is inflamed (swollen) and infected. This causes the follicle to swell under the skin, creating uncomfortable bumps on the surface of your skin. […] However, there are certain factors that can increase your risk of developing folliculitis. A few risks can include: If you shave often. […] Infection of the hair follicle with Staphylococcus aureus bacteria is one of the most common causes of folliculitis. […] Pseudomonas aeruginosa is a bacteria that thrives in heated, moving water (hot tubs, whirlpools, water slides). It can infect the hair follicle and cause a rash that looks a lot like the one caused by the staphylococcal species.

• #1 Folliculitis: Appearance, Causes, Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/17692-folliculitis

  Malassezia are a family of yeast that can normally be found on the skin. Sometimes, when Malassezia gets into the hair follicles, it can cause an itchy condition that looks like an acne breakout. […] Gram-negative folliculitis can happen after prolonged antibiotic use to treat acne. Over time, resistant bacteria grow and multiply. […] Boils, or furuncles, occur when the hair follicle becomes deeply infected. […] A carbuncle forms when several boils appear in one spot. […] Eosinophilic folliculitis is usually seen in patients who are immunosuppressed (the immune system is not fully functioning).

• #1 Folliculitis

  https://dermnetnz.org/topics/folliculitis

  Folliculitis can be due to infection, occlusion (blockage), irritation and various skin diseases. […] Bacterial folliculitis is commonly due to Staphylococcus aureus. […] Spa pool folliculitis is due to infection with Pseudomonas aeruginosa, which thrives in warm water. […] The most common yeast to cause a folliculitis is Pityrosporum ovale, also known as Malassezia. […] Candida albicans can also provoke a folliculitis in skin folds (intertrigo) or the beard area. […] Folliculitis may be caused by the herpes simplex virus. […] Folliculitis may arise as hairs regrow after shaving, waxing, electrolysis, or plucking. […] Paraffin-based ointments, moisturisers, and adhesive plasters may all result in a sterile folliculitis. […] Overuse of topical steroids may produce a folliculitis.

• #1 Folliculitis – Wikipedia

  https://en.wikipedia.org/wiki/Folliculitis

  Tinea barbae is similar to barber’s itch, but the infection is caused by the fungus T. rubrum. […] Malassezia folliculitis, formerly known as Pityrosporum folliculitis, is caused by yeasts (part of the fungus kingdom) of the genus Malassezia. […] Demodex folliculitis is usually caused by an overgrowth of Demodex folliculorum, a mite that lives in human hair follicles. […] Herpetic folliculitis is rarer, but may occur when herpes simplex virus infection spreads to nearby hair follicles appearing in groups or clusters, mostly around the mouth. […] Pseudofolliculitis barbae is a disorder occurring when hair curves back into the skin and causes inflammation. […] Eosinophilic folliculitis may appear in persons with impaired immune systems. […] Folliculitis decalvans or tufted folliculitis usually affects the scalp. Several hairs arise from the same hair follicle. Scarring and permanent hair loss may follow. The cause is unknown. […] Oil folliculitis is inflammation of hair follicles due to exposure to various oils, and typically occurs on forearms or thighs. It is common in refinery workers, road workers, mechanics, and sheep shearers. Even makeup may cause it.

• #1 Folliculitis – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK547754/

  Folliculitis is a common skin condition that usually involves infection of the hair follicle. […] Most commonly, folliculitis is caused by bacterial infection of the superficial or deep hair follicle. However, this condition may also be caused by fungal species, viruses and can even be noninfectious in nature. […] Superficial bacterial folliculitis The most common form of folliculitis, this particular condition is usually caused by the bacteria Staphylococcus aureus. […] Gram-negative bacterial folliculitis – Commonly referred to as hot tub folliculitis, this condition results from the bacteria pseudomonas aeruginosa. […] Pityrosporum Folliculitis – This particular form of folliculitis is fungal, caused by the Malassezia species of fungi such as Malassezia furfur. […] Viral folliculitis – Most commonly caused by herpes virus it could also be caused by Molluscum contagiosum, but this is far rarer.

• #1 Folliculitis: Causes, Symptoms, and Treatment | Doctor

  https://patient.info/doctor/folliculitis-pro

  Commonly in men, as tinea barbae in the beard area. […] May also be caused by contact with dogs/cattle/other animals. […] Resembles bacterial infection but may have a clearly demarcated flaking edge of confluent erythema. […] Viral infection: […] Herpetic folliculitis due to herpes simplex viruses (HSV); often in men who shave near oral cold sore lesions. […] Varicella zoster and mollluscum contagiosum are commonly responsible for viral folliculitis. […] Immune system: […] Eosinophilic pustular folliculitis; sterile and intensely itchy eruption associated with HIV infection. […] Eosinophilic folliculitis (a rare autoimmune disease, more common in Asian races). […] Physical irritation – eg, traction folliculitis as a result of a hairstyle. […] Chemical irritation of the skin (less commonly) – eg, from oily overalls.

• #1 Folliculitis – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK547754/

  Demodex folliculitis – a type of folliculitis caused by the mite Demodex folliculorum. […] Eosinophilic folliculitis – This particular brand of folliculitis is found predominantly in those with advanced HIV or those with low CD4 counts. […] While the exact etiology of this condition is unknown, studies suggest it could result from inflammatory disease secondary to immune dysregulation and that there may be an associated underlying infection.

• #1 Folliculitis – causes and treatment | healthdirect

  https://www.healthdirect.gov.au/folliculitis

  Folliculitis is an inflammation of the hair follicles in your skin. […] Folliculitis causes painful red bumps each with a hair in the middle. […] Treatment of folliculitis depends on its cause. […] Folliculitis often appears in sweaty areas or around the beard area in men. It is more likely to happen if you wear tight clothing. […] Non-infective folliculitis can be caused by: shaving and waxing, obesity, heavy sweating. […] Some medicines can also cause folliculitis, such as corticosteroids especially in the form of creams and ointments used on the skin, extended use of antibiotics (which can cause gram negative folliculitis), medicines that suppress the immune system. […] Infective folliculitis can be caused by: bacteria, viruses, fungi. […] The most common bacteria that cause folliculitis are: staphylococcus aureus (bacterial folliculitis) commonly found on your skin, pseudomonas aeruginosa (hot tub folliculitis) found in hot tubs and spas. […] Other causes of infective folliculitis are: demodex mites, malassezia yeasts (pityrosporum folliculitis), herpes simplex virus.

• #1 Folliculitis Scalp: Symptoms, Pictures, Shampoos, and Other Treatments

  https://www.healthline.com/health/folliculitis-scalp

  Folliculitis is a common inflammatory skin condition affecting your hair follicles. Its usually caused by a fungal or bacterial infection. […] Folliculitis is caused by damage to your hair follicles, which leaves them vulnerable to infection-causing bacteria and fungi. […] Many things can damage the hair follicles on your scalp, such as frequently scratching or rubbing your head, tugging on or twisting your hair, wearing hairstyles that pull your hair, such as tight ponytails or braids, frequently wearing hats, shaving your head, wearing sports helmets, using a lot of hair products, which can build up over time. […] Several things can also increase your risk of developing scalp folliculitis, including having acne or dermatitis, being a male with coarse or curly hair, having a weakened immune system due to an underlying condition, taking certain medications for acne, including steroid creams or antibiotic therapy.

• #1 Folliculitis

  https://dermnetnz.org/topics/folliculitis

  Eosinophilic folliculitis is a specific type of folliculitis that may arise in some immune-suppressed individuals such as those infected by human immunodeficiency virus (HIV) or those who have cancer. […] Folliculitis may be due to drugs, particularly corticosteroids (steroid acne), androgens (male hormones), adrenocorticotrophic hormone (ACTH), lithium, isoniazid (INH), phenytoin and B-complex vitamins. […] Certain uncommon inflammatory skin diseases may cause permanent hair loss and scarring because of deep-seated sterile folliculitis.

• #1 Folliculitis | Beacon Health System

  https://www.beaconhealthsystem.org/library/diseases-and-conditions/folliculitis?content_id=CON-20311566

  Folliculitis is often caused when hair follicles are infected with bacteria, commonly Staphylococcus aureus (staph). It may also be caused by viruses, fungi, parasites, medications or physical injury. Sometimes the cause isn’t known. […] When hair follicles are damaged, they may be invaded by viruses, bacteria and fungi. This can lead to development of folliculitis. […] Certain factors increase the risk of getting it, including: Regularly wearing clothing that traps heat and sweat, such as rubber gloves or high boots; Soaking in a hot tub, whirlpool or public pool that’s not maintained well; Causing damage to hair follicles through shaving, waxing, wearing tight clothes or hair styling practices such as traction, wigs and oils; Using some medications, such as corticosteroid creams, prednisone, long-term antibiotic therapy for acne and certain chemotherapy drugs; Having dermatitis or excessive sweating (hyperhidrosis); Having diabetes, HIV/AIDS or another condition that lowers your resistance to infections.

• #1 Folliculitis: Practice Essentials, Pathophysiology, Etiology

  https://emedicine.medscape.com/article/1070456-overview

  Folliculitis is a relatively common condition that arises due to an accumulation of inflammatory cells within the superficial or deep aspect of the hair follicle and has either an infectious or non-infectious etiology. […] The most common causes of folliculitis include: A. Infectious: bacterial, fungal, viral, parasitic, and folliculitis of secondary syphilis B. Non-infectious: Friction (acne mechanica), Occlusion, Drug induced, Inflammatory C. Idiopathic. […] Predisposing factors include: Altered immune status, Prior skin injury, Friction (acne mechanica) and other causes of minor follicular trauma (plucking, shaving, waxing, electrolysis, laser), Staphylococcal carrier status, Malnutrition, Diabetes, Obesity, Occlusion with topical products (paraffin or petrolum-based ointments, oils, grease, adhesive plasters), Use of certain medications (topical and systemic steroids, lithium, phenytoin, disulfiram, contraceptive agents, testosterone, danazol, stanozolol, antiepileptics, ethionamide, isoniazid, rifampicin, cyclosporin, sirolimus, epidermal growth factor receptor inhibitors, various targeted therapies to treat advanced melanoma, halogens (iodides and bromides), long-term use of antibiotics and occassionally excess vitamins (B1, B6, B12). […] Folliculitis has also been reported following smallpox or anthrax vaccine. These cases are more common in military troops who are vaccinated prior to being deployed. […] Poorly chlorinated hot tubs. […] Actinic damage.

• #1 Folliculitis: Causes, symptoms, and treatment

  https://www.medicalnewstoday.com/articles/318551

  Folliculitis is generally the result of an infection in a damaged hair follicle. […] Infection by Staphylococcus aureus bacteria, yeast, fungus, and viruses can all cause folliculitis. […] The most common cause of folliculitis is a bacterial infection of the deep hair follicle. […] Other causes include: skin irritation, occlusion, or blockage, of the follicle, topical steroids, skin disorders, such as acne or dermatitis, some medications, irritant chemicals, immunosuppressive medications.

• #1 Special types of folliculitis which should be differentiated from acne

  https://pmc.ncbi.nlm.nih.gov/articles/PMC5821164/

  Because both acne vulgaris and folliculitis can present as inflammatory erythematous papules, pustules or nodules, they are often hard to distinguish. […] Folliculitis refers to inflammation of the hair follicle, aroused by staphylococcus aureus (S.a) or other noninfectious factors. […] Therefore, we need to understand and differentiate skin diseases with acne-like manifestation to help us with diagnosis and treatment. […] SPF, the result of inflammatory changes confined to the follicle orifice, is also known as follicular impetigo or Bockhart impetigo and is always caused by S.a. […] Folliculitis barbae, a perifollicular chronic staphylococcal infection of the bearded area, is a medical term for persistent irritation caused by shaving and commonly occurs in men aged 20 to 40. […] Perifolliculitis capitis abscedens et suffodiens, also known as dissecting cellulitis of the scalp (DCS) or Hoffman disease, is a chronic inflammatory disorder of the scalp characterized by fluctuating, interconnecting nodules.

• #1 Folliculitis decalvans – BAD Patient Hub

  https://www.skinhealthinfo.org.uk/condition/folliculitis-decalvans/

  Folliculitis decalvans is a rare long-term condition of the scalp causing inflammation and hair loss. […] The exact cause of folliculitis decalvans is unknown but it may be due to a reaction to a bacterium called Staphylococcus aureus (Staph aureus), which is naturally present on healthy skin. […] Generally, folliculitis decalvans is not thought to be contagious. […] There are many different treatments available to control the inflammation, but unfortunately no cure has been found.

• #1 Special types of folliculitis which should be differentiated from acne

  https://pmc.ncbi.nlm.nih.gov/articles/PMC5821164/

  Folliculitis keloidalis nuchae, also known as acne keloidalis, is a rare, idiopathic, inflammatory condition of the posterior neck. […] Actinic folliculitis, a rare photodermatosis, usually appear between 4 and 24 hours after exposure to sunlight. […] EPF is characterized by recurrent crops of sterile, intensely pruritic follicular papules and pustules with central clearing and peripheral extension. […] Malassezia folliculitis, formerly known as pityrosporum folliculitis, is a fungal acneiform condition. […] EGFR inhibitors such as gefitinib, cetuximab are increasingly used for the treatment of advanced lung, pancreatic, colorectal, and head and neck cancers. […] It’s very important to study special types of folliculitis which can be differentiated from acne.

• #1 Folliculitis – Diagnosis & treatment – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/folliculitis/diagnosis-treatment/drc-20361662

  Your health care provider will likely be able to tell whether you have folliculitis by looking at your skin and asking about your medical history. […] If early treatments don’t clear up your infection, your health care provider may run some tests. These tests might include: […] Treatments for folliculitis depend on the type and severity of your condition, what self-care measures you’ve already tried, and how you’d like to proceed. […] If you’ve tried nonprescription products for a few weeks and they haven’t helped, ask your health care provider about prescription-strength medications. […] A dermatologist can help you: […] Even if treatment helps, the infection may come back. […] For mild infection caused by bacteria, your health care provider may prescribe an antibiotic lotion or gel.

• #2 Folliculitis – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK547754/

  Folliculitis is a common skin condition that usually involves infection of the hair follicle. […] Most commonly, folliculitis is caused by bacterial infection of the superficial or deep hair follicle. However, this condition may also be caused by fungal species, viruses and can even be noninfectious in nature. […] Superficial bacterial folliculitis The most common form of folliculitis, this particular condition is usually caused by the bacteria Staphylococcus aureus. […] Gram-negative bacterial folliculitis – Commonly referred to as hot tub folliculitis, this condition results from the bacteria pseudomonas aeruginosa. […] Pityrosporum Folliculitis – This particular form of folliculitis is fungal, caused by the Malassezia species of fungi such as Malassezia furfur. […] Viral folliculitis – Most commonly caused by herpes virus it could also be caused by Molluscum contagiosum, but this is far rarer.

• #2 Hot tub folliculitis Information | Mount Sinai – New York

  https://www.mountsinai.org/health-library/diseases-conditions/hot-tub-folliculitis

  Hot tub folliculitis is caused by Pseudomonas aeruginosa, a bacteria that survives in hot tubs, especially tubs made of wood. […] The bacteria can also be found in whirlpools and swimming pools, or on contaminated water-associated objects such as gloves, towels, pool toys, or sponges.

• #2 Folliculitis: Causes, Symptoms, and Treatment | Doctor

  https://patient.info/doctor/folliculitis-pro

  Folliculitis causes (aetiology)2 […] It can be caused by: […] Bacterial infection: […] S. aureus is the most common. […] Pseudomonas spp. – occurring in outbreaks associated with hot tubs, paddling pools, etc. Causes intense pruritus, particularly in areas under a bathing suit (hot tub folliculitis). […] Gram-negative folliculitis affects patients with a history of long-term antibiotic therapy for acne: […] Pathogens include Klebsiella spp., Enterobacter spp. and Proteus spp. […] Fungal infection: […] Malassezia folliculitis (previously called pityrosporum folliculitis) causes itchy acneiform eruption on the upper back, upper arms, chest, neck, chin and face, affecting younger patients. […] Other fungal folliculitis: […] Due to Candida spp. and Trichophyton spp.

• #2 Folliculitis Treatment, Causes, Symptoms, Risk Factors and More – Dr. Axe

  https://draxe.com/health/folliculitis/

  Fungi: Ringworm of the scalp can cause folliculitis symptoms and result in scaly hair loss. […] Viral Infection: Certain common viruses, including the herpes simplex virus and herpes zoster (shingles) virus, can cause folliculitis. […] Parasitic Infection: This type of infection most often affects immunosuppressed adults and healthy seniors. […] Ingrown Hairs: Often a result of improper shaving, electrolysis, plucking or waxing. […] Contact Reaction: Certain topical preparations, including paraffin-based ointments, moisturizers, certain chemicals and the overuse of topical steroids, are associated with folliculitis. […] Medications: Certain medications, including corticosteroids, androgens, ACTH, lithium, isoniazid, phenytoin, B-complex vitamins, protein kinase inhibitors and certain medications for metastatic melanoma, can cause folliculitis.

• #2 Folliculitis: Causes, Symptoms, and Treatment | Doctor

  https://patient.info/doctor/folliculitis-pro

  Commonly in men, as tinea barbae in the beard area. […] May also be caused by contact with dogs/cattle/other animals. […] Resembles bacterial infection but may have a clearly demarcated flaking edge of confluent erythema. […] Viral infection: […] Herpetic folliculitis due to herpes simplex viruses (HSV); often in men who shave near oral cold sore lesions. […] Varicella zoster and mollluscum contagiosum are commonly responsible for viral folliculitis. […] Immune system: […] Eosinophilic pustular folliculitis; sterile and intensely itchy eruption associated with HIV infection. […] Eosinophilic folliculitis (a rare autoimmune disease, more common in Asian races). […] Physical irritation – eg, traction folliculitis as a result of a hairstyle. […] Chemical irritation of the skin (less commonly) – eg, from oily overalls.

• #2 Folliculitis treatment and prevention – Harvard Health

  https://www.health.harvard.edu/diseases-and-conditions/folliculitis-treatment-and-prevention

  Folliculitis is most often caused by bacterial infection. Other infectious causes of folliculitis include fungi, viruses, and parasites. Folliculitis can also result from noninfectious causes, for example, when hair follicles are irritated or damaged by things like shaving or rubbing against right clothing. […] Staphylococcus aureus bacteria are the most common cause of bacterial folliculitis. So-called „hot tub” folliculitis is usually caused by Pseudomonas aeruginosa bacteria and may occur in people who use hot tubs with poorly maintained water. […] This condition is caused by tiny Demodex mites, which live in the hair follicles and oil glands on our skin. When there are too many of these mites, they can cause irritation and redness, leading to folliculitis. This is most common in people with rosacea. […] Also called pseudofolliculitis, this can be caused by irritation from shaving or wearing tight clothing.

• #2 Folliculitis

  https://dermnetnz.org/topics/folliculitis

  Folliculitis can be due to infection, occlusion (blockage), irritation and various skin diseases. […] Bacterial folliculitis is commonly due to Staphylococcus aureus. […] Spa pool folliculitis is due to infection with Pseudomonas aeruginosa, which thrives in warm water. […] The most common yeast to cause a folliculitis is Pityrosporum ovale, also known as Malassezia. […] Candida albicans can also provoke a folliculitis in skin folds (intertrigo) or the beard area. […] Folliculitis may be caused by the herpes simplex virus. […] Folliculitis may arise as hairs regrow after shaving, waxing, electrolysis, or plucking. […] Paraffin-based ointments, moisturisers, and adhesive plasters may all result in a sterile folliculitis. […] Overuse of topical steroids may produce a folliculitis.

• #2 Folliculitis: Causes, Diagnosis, Treatment and Care at Home | Nationwide Children’s Hospital

  https://www.nationwidechildrens.org/conditions/folliculitis

  Folliculitis is a skin condition that happens when hair follicles become inflamed. […] There are several reasons why hair follicles might become inflamed (red or irritated): […] Bacterial infections. An infection by common or normal bacteria on the skin surface is the most common cause of folliculitis. […] Ingrown hairs. This may occur after shaving the hair anywhere on the body. […] Friction (rubbing) from tight clothing or sports equipment. […] Blocked follicles. Thick moisturizers, medicines, tight bandages, sports equipment, casts or braces can plug hair follicles. […] Excessive sweating.

• #2 Folliculitis: Symptoms, Treatment, and Prevention

  https://patient.info/skin-conditions/skin-rashes/folliculitis

  Folliculitis means inflammation of the hair follicles. […] There are a number of causes of inflammation which can result in folliculitis. […] Folliculitis occurs at sites where hair follicles are inflamed. There are a number of causes: Infection. Most folliculitis infections are caused by a bacteria called Staphylococcus aureus (S. aureus), which usually lives harmlessly on the skin. Occasionally other bacteria, fungi (Pityrosporum or Candida albicans) or parasites are the cause. […] Physical irritation caused by shaving or friction. […] Chemical irritation caused by chemicals applied to the skin. […] Blockage of the hair follicle eg, by dead skin cells or thick creams. […] Excessive sweating (hyperhidrosis) due to overactivity of the sweat glands. […] Steroid creams. […] Inflammatory skin conditions are an uncommon cause.

• #2 Folliculitis: Causes, Contagious, Symptoms & Treatment

  https://www.emedicinehealth.com/folliculitis/article_em.htm

  Folliculitis is an inflammation of the hair follicle, a structure composed of cells designed to produce hair. […] Causes of folliculitis include bacteria, fungi parasites, chemicals, and drugs. […] Infections by bacteria (Staphylococcus aureus for example), fungi (yeasts and dermatophytes), viruses (herpes simplex), and parasites (Demodex mites) can cause folliculitis. […] Noninfectious causes of folliculitis include topical irritants (insoluble cutting oils are an example), physical irritants (hair extraction), certain drugs, teenage pimples (acne vulgaris), and certain auto-inflammatory conditions (folliculitis decalvans). […] Exposure to potential infectious agents and certain types of occupational exposures can predispose to folliculitis. […] There is a well-known condition called „hot tub folliculitis” which can affect those who frequent poorly maintained hot tubs. […] A group of new anticancer drugs, epidermal growth factor receptor inhibitors, can produce a facial folliculitis.

• #2 Folliculitis: discover symptoms, causes and treatments – Carpe Clinic%

  https://carpe.be/en/aandoening/folliculitis-the-treatment-of-inflamed-hair-follicles/

  The use of certain oils and cosmetics can also contribute to the development of folliculitis. […] People with certain health conditions such as diabetes or a weakened immune system may be at increased risk for folliculitis. […] Personal hygiene habits and environmental factors may also play a role.

• #2 Folliculitis

  https://dermnetnz.org/topics/folliculitis

  Eosinophilic folliculitis is a specific type of folliculitis that may arise in some immune-suppressed individuals such as those infected by human immunodeficiency virus (HIV) or those who have cancer. […] Folliculitis may be due to drugs, particularly corticosteroids (steroid acne), androgens (male hormones), adrenocorticotrophic hormone (ACTH), lithium, isoniazid (INH), phenytoin and B-complex vitamins. […] Certain uncommon inflammatory skin diseases may cause permanent hair loss and scarring because of deep-seated sterile folliculitis.

• #2 Folliculitis – causes and treatment | healthdirect

  https://www.healthdirect.gov.au/folliculitis

  Folliculitis is an inflammation of the hair follicles in your skin. […] Folliculitis causes painful red bumps each with a hair in the middle. […] Treatment of folliculitis depends on its cause. […] Folliculitis often appears in sweaty areas or around the beard area in men. It is more likely to happen if you wear tight clothing. […] Non-infective folliculitis can be caused by: shaving and waxing, obesity, heavy sweating. […] Some medicines can also cause folliculitis, such as corticosteroids especially in the form of creams and ointments used on the skin, extended use of antibiotics (which can cause gram negative folliculitis), medicines that suppress the immune system. […] Infective folliculitis can be caused by: bacteria, viruses, fungi. […] The most common bacteria that cause folliculitis are: staphylococcus aureus (bacterial folliculitis) commonly found on your skin, pseudomonas aeruginosa (hot tub folliculitis) found in hot tubs and spas. […] Other causes of infective folliculitis are: demodex mites, malassezia yeasts (pityrosporum folliculitis), herpes simplex virus.

• #2 Folliculitis: Practice Essentials, Pathophysiology, Etiology

  https://emedicine.medscape.com/article/1070456-overview

  Folliculitis is a relatively common condition that arises due to an accumulation of inflammatory cells within the superficial or deep aspect of the hair follicle and has either an infectious or non-infectious etiology. […] The most common causes of folliculitis include: A. Infectious: bacterial, fungal, viral, parasitic, and folliculitis of secondary syphilis B. Non-infectious: Friction (acne mechanica), Occlusion, Drug induced, Inflammatory C. Idiopathic. […] Predisposing factors include: Altered immune status, Prior skin injury, Friction (acne mechanica) and other causes of minor follicular trauma (plucking, shaving, waxing, electrolysis, laser), Staphylococcal carrier status, Malnutrition, Diabetes, Obesity, Occlusion with topical products (paraffin or petrolum-based ointments, oils, grease, adhesive plasters), Use of certain medications (topical and systemic steroids, lithium, phenytoin, disulfiram, contraceptive agents, testosterone, danazol, stanozolol, antiepileptics, ethionamide, isoniazid, rifampicin, cyclosporin, sirolimus, epidermal growth factor receptor inhibitors, various targeted therapies to treat advanced melanoma, halogens (iodides and bromides), long-term use of antibiotics and occassionally excess vitamins (B1, B6, B12). […] Folliculitis has also been reported following smallpox or anthrax vaccine. These cases are more common in military troops who are vaccinated prior to being deployed. […] Poorly chlorinated hot tubs. […] Actinic damage.

• #2 Folliculitis: Causes, Symptoms, and Treatment

  https://www.webmd.com/skin-problems-and-treatments/what-is-folliculitis

  You also might be more likely to have folliculitis if you: Have acne, especially if you use a steroid cream or long-term antibiotic for it, are a man who has curly hair and shaves, wear tight clothes, rubber gloves, or boots that dont let sweat or heat out, spend time in a pool or hot tub thats not cleaned regularly, have an illness that affects your immune system, like diabetes, leukemia, or HIV or AIDS. […] Bacteria and fungi are common triggers for folliculitis. So are heavy or oily skin products and hair removal techniques like shaving and waxing.

• #2 Folliculitis: Causes, Symptoms, Treatment

  https://www.health.com/folliculitis-7374055

  Folliculitis is a skin condition that typically involves inflammation of hair follicles, tiny openings on the skin through which hairs grow. […] The cause of folliculitis is sometimes unclear. However, it seems to be commonly caused by an infection due to bacteria, viruses, parasites (like the Demodex mite), or fungi. Staphylococcus aureus bacteria is the most common cause. […] It can also be caused by irritation or blockage of the follicle, for example, after shaving or tweezing, or friction caused by your skin rubbing against clothing. Inflammation due to ingrown hairs can cause folliculitis, as can medications like lithium and cyclosporine. […] Risk factors for folliculitis include: Obesity, Diabetes, Frequent shaving, plucking, or waxing, Long-term use of oral antibiotics, Wearing tight clothing, Soaking in a hot tub, A weak immune system.

• #2 Folliculitis: Causes, Symptoms, and Treatment

  https://www.webmd.com/skin-problems-and-treatments/what-is-folliculitis

  Folliculitis is a skin problem that happens when you get bacteria or a blockage in a tiny pocket in your skin called a hair follicle. […] Staph bacteria is most often to blame. You have staph on your skin all the time, and it normally doesnt cause any issues. But if it gets inside your body, say through a cut, it can cause problems. […] These other things can also cause folliculitis: Blockages from skin products, such as moisturizers with oils, a fungus, hair removal, such as shaving, waxing, and plucking, ingrown hairs, other bacteria, such as the kind you might find in a hot tub, some drugs, such as corticosteroids that are used to ease inflammation. […] In general, youre more likely to get the condition if you have damaged follicles. This can happen from things such as shaving, skin injuries, sticky bandages, and tight clothes.

• #2 Folliculitis barbae: Causes, Management, and More – DermNet

  https://dermnetnz.org/topics/folliculitis-barbae

  Folliculitis barbae is most often due to Staphylococcus aureus (S. aureus) colonization of more superficial portions of the hair follicle (for example, the infundibulum) and skin surface. […] Cases of folliculitis barbae may occur secondary to viral, mycologic, or eosinophilic causes, and may be seen in competitive athletes and immunosuppressed persons. […] Reinfection by S. aureus after successful treatment may suggest persistent colonization of S. aureus within the nasal cavity or on previously used shaving equipment, such as razors.

• #2 Special types of folliculitis which should be differentiated from acne

  https://pmc.ncbi.nlm.nih.gov/articles/PMC5821164/

  Folliculitis keloidalis nuchae, also known as acne keloidalis, is a rare, idiopathic, inflammatory condition of the posterior neck. […] Actinic folliculitis, a rare photodermatosis, usually appear between 4 and 24 hours after exposure to sunlight. […] EPF is characterized by recurrent crops of sterile, intensely pruritic follicular papules and pustules with central clearing and peripheral extension. […] Malassezia folliculitis, formerly known as pityrosporum folliculitis, is a fungal acneiform condition. […] EGFR inhibitors such as gefitinib, cetuximab are increasingly used for the treatment of advanced lung, pancreatic, colorectal, and head and neck cancers. […] It’s very important to study special types of folliculitis which can be differentiated from acne.

• #2 Folliculitis – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK547754/

  Demodex folliculitis – a type of folliculitis caused by the mite Demodex folliculorum. […] Eosinophilic folliculitis – This particular brand of folliculitis is found predominantly in those with advanced HIV or those with low CD4 counts. […] While the exact etiology of this condition is unknown, studies suggest it could result from inflammatory disease secondary to immune dysregulation and that there may be an associated underlying infection.

• #2 Scalp Folliculitis According to the NHS: Causes & Treatments

  https://wimpoleclinic.com/blog/scalp-folliculitis-according-to-the-nhs-causes-treatments/

  While most types of folliculitis develop more frequently in immunocompromised people, there are certain types, such as eosinophilic folliculitis, which are specific to HIV-positive patients or people undergoing chemotherapy. […] Researchers are still trying to understand what causes some types of non-infectious scalp folliculitis, which is likely a combination of genetic predisposition, a weakened immune system and the presence of bacteria. […] One of these is folliculitis decalvans, a rare condition which leads to scarring alopecia through the destruction of the hair follicle. […] However, in rare cases, untreated scalp folliculitis can progress, causing complications that can lead to scarring and hair loss.

• #2 Pathology Outlines – Folliculitis

  https://www.pathologyoutlines.com/topic/skinnontumorfolliculitis.html

  Caused by infection, friction and other causes of follicular trauma, excessive perspiration and occlusion […] Infectious cases are either superficial (fungi, bacteria, syphilis, viral) or deep (usually granulomatous and due to either fungi or bacteria) […] Fungal forms may be endothrix (spores are within hair shaft) or ectothrix (spores are on outer surface of hair shaft) […] Noninfectious cases are either superficial / suppurative (acne vulgaris, rosacea, follicular mucinosis, steroid induced), deep / granulomatous (acne vulgaris-conglobate and keloidal forms or perforating) or spongiotic (Fox-Fordyce disease, atopic dermatitis, pruritic folliculitis of pregnancy) […] Epidermal growth factor receptor (EGFR) inhibitors appear to be relevant in folliculitis by causing abnormal epidermal differentiation that leads to follicular obstruction and subsequent inflammation (Br J Dermatol 2001;144:1169)

• #2 Folliculitis – Diagnosis & treatment – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/folliculitis/diagnosis-treatment/drc-20361662

  Antifungals are for infections caused by yeast rather than bacteria. […] If you have mild eosinophilic folliculitis, your health care provider may suggest you try a steroid cream to ease the itching. […] If you have a large boil or carbuncle, your health care provider may make a small cut in it to drain the pus. […] Your health care provider may suggest laser hair removal as an option for pseudofolliculitis barbae, especially when other treatments haven’t improved your symptoms. […] Mild cases of bacterial folliculitis often improve with home care. […] Self-care measures may help relieve your symptoms.

• #3 Folliculitis – causes and treatment | healthdirect

  https://www.healthdirect.gov.au/folliculitis

  Folliculitis is an inflammation of the hair follicles in your skin. […] Folliculitis causes painful red bumps each with a hair in the middle. […] Treatment of folliculitis depends on its cause. […] Folliculitis often appears in sweaty areas or around the beard area in men. It is more likely to happen if you wear tight clothing. […] Non-infective folliculitis can be caused by: shaving and waxing, obesity, heavy sweating. […] Some medicines can also cause folliculitis, such as corticosteroids especially in the form of creams and ointments used on the skin, extended use of antibiotics (which can cause gram negative folliculitis), medicines that suppress the immune system. […] Infective folliculitis can be caused by: bacteria, viruses, fungi. […] The most common bacteria that cause folliculitis are: staphylococcus aureus (bacterial folliculitis) commonly found on your skin, pseudomonas aeruginosa (hot tub folliculitis) found in hot tubs and spas. […] Other causes of infective folliculitis are: demodex mites, malassezia yeasts (pityrosporum folliculitis), herpes simplex virus.

• #3 Folliculitis: Causes, Diagnosis, Treatment and Care at Home | Nationwide Children’s Hospital

  https://www.nationwidechildrens.org/conditions/folliculitis

  Folliculitis is a skin condition that happens when hair follicles become inflamed. […] There are several reasons why hair follicles might become inflamed (red or irritated): […] Bacterial infections. An infection by common or normal bacteria on the skin surface is the most common cause of folliculitis. […] Ingrown hairs. This may occur after shaving the hair anywhere on the body. […] Friction (rubbing) from tight clothing or sports equipment. […] Blocked follicles. Thick moisturizers, medicines, tight bandages, sports equipment, casts or braces can plug hair follicles. […] Excessive sweating.

• #3 Folliculitis: Symptoms, Treatment, and Prevention

  https://patient.info/skin-conditions/skin-rashes/folliculitis

  Folliculitis means inflammation of the hair follicles. […] There are a number of causes of inflammation which can result in folliculitis. […] Folliculitis occurs at sites where hair follicles are inflamed. There are a number of causes: Infection. Most folliculitis infections are caused by a bacteria called Staphylococcus aureus (S. aureus), which usually lives harmlessly on the skin. Occasionally other bacteria, fungi (Pityrosporum or Candida albicans) or parasites are the cause. […] Physical irritation caused by shaving or friction. […] Chemical irritation caused by chemicals applied to the skin. […] Blockage of the hair follicle eg, by dead skin cells or thick creams. […] Excessive sweating (hyperhidrosis) due to overactivity of the sweat glands. […] Steroid creams. […] Inflammatory skin conditions are an uncommon cause.

• #3 What Happens if Folliculitis Goes Untreated?

  https://www.medicinenet.com/what_happens_if_folliculitis_goes_untreated/article.htm

  Folliculitis is inflammation of these hair follicles, and it can appear anywhere on your skin where hair grows. […] Folliculitis is caused by infection or irritation to the skin. […] Types and causes of folliculitis include: […] Bacterial folliculitis is an infection in the follicle caused by Staphylococcus aureus bacteria. […] Hot tub folliculitis is an infection caused by Pseudomonas aeruginosa bacteria. […] Razor bumps, known as pseudofolliculitis barbae, are caused by shaving too close to the skin. […] Pseudofolliculitis barbae can develop into deep folliculitis called sycosis barbae. […] Fungal folliculitis is caused by the Malassezia fungi. […] Gram-negative folliculitis is caused by prolonged antibiotic use. […] Eosinophilic folliculitis is found in people with compromised immune systems. […] If folliculitis is left untreated, boils (or skin abscesses) can develop. […] If boils or carbuncles are left untreated, a serious skin infection may develop called cellulitis. […] Infections left untreated may result in serious or deep infections that may spread or cause permanent scarring.

• #3 Pityrosporum (Malassezia) Folliculitis: Causes & Treatment

  https://my.clevelandclinic.org/health/diseases/22833-pityrosporum-folliculitis

  Pityrosporum (Malassezia) folliculitis happens when yeast that occurs as part of your skins natural flora multiplies and infects the hair follicles. […] When too much Malassezia grows and gets into your hair follicles, pityrosporum (Malassezia) folliculitis may develop. […] A yeast called Malassezia (pityrosporum) causes this condition. When too much of this yeast grows on your skin and gets into your hair follicles, it causes a fungal infection. […] Pityrosporum folliculitis happens when too much Malassezia yeast grows on the skin and infects the hair follicles.

• #3 Folliculitis Treatment, Causes, Symptoms, Risk Factors and More – Dr. Axe

  https://draxe.com/health/folliculitis/

  Fungi: Ringworm of the scalp can cause folliculitis symptoms and result in scaly hair loss. […] Viral Infection: Certain common viruses, including the herpes simplex virus and herpes zoster (shingles) virus, can cause folliculitis. […] Parasitic Infection: This type of infection most often affects immunosuppressed adults and healthy seniors. […] Ingrown Hairs: Often a result of improper shaving, electrolysis, plucking or waxing. […] Contact Reaction: Certain topical preparations, including paraffin-based ointments, moisturizers, certain chemicals and the overuse of topical steroids, are associated with folliculitis. […] Medications: Certain medications, including corticosteroids, androgens, ACTH, lithium, isoniazid, phenytoin, B-complex vitamins, protein kinase inhibitors and certain medications for metastatic melanoma, can cause folliculitis.

• #3 Folliculitis – Wikipedia

  https://en.wikipedia.org/wiki/Folliculitis

  Tinea barbae is similar to barber’s itch, but the infection is caused by the fungus T. rubrum. […] Malassezia folliculitis, formerly known as Pityrosporum folliculitis, is caused by yeasts (part of the fungus kingdom) of the genus Malassezia. […] Demodex folliculitis is usually caused by an overgrowth of Demodex folliculorum, a mite that lives in human hair follicles. […] Herpetic folliculitis is rarer, but may occur when herpes simplex virus infection spreads to nearby hair follicles appearing in groups or clusters, mostly around the mouth. […] Pseudofolliculitis barbae is a disorder occurring when hair curves back into the skin and causes inflammation. […] Eosinophilic folliculitis may appear in persons with impaired immune systems. […] Folliculitis decalvans or tufted folliculitis usually affects the scalp. Several hairs arise from the same hair follicle. Scarring and permanent hair loss may follow. The cause is unknown. […] Oil folliculitis is inflammation of hair follicles due to exposure to various oils, and typically occurs on forearms or thighs. It is common in refinery workers, road workers, mechanics, and sheep shearers. Even makeup may cause it.

• #3 Folliculitis: Causes, symptoms, and treatment

  https://www.medicalnewstoday.com/articles/318551

  Folliculitis is generally the result of an infection in a damaged hair follicle. […] Infection by Staphylococcus aureus bacteria, yeast, fungus, and viruses can all cause folliculitis. […] The most common cause of folliculitis is a bacterial infection of the deep hair follicle. […] Other causes include: skin irritation, occlusion, or blockage, of the follicle, topical steroids, skin disorders, such as acne or dermatitis, some medications, irritant chemicals, immunosuppressive medications.

• #3 Acne-like breakouts could be folliculitis

  https://www.aad.org/public/diseases/a-z/folliculitis

  This is a common skin infection that develops in the hair follicles. […] You get folliculitis when you damage your hair follicles. Once damaged, its easy for germs to get inside the follicles and cause an infection. A common source of infection is Staph aureus, which is found on our skin. Other organisms on our skin can also cause an infection. […] While many things can damage your hair follicles, the following are common causes of folliculitis: Hot tub (improperly maintained), Shaving, plucking, or waxing, Tight clothing or equipment, Medication applied to the skin, such as coal tar, Medication you take, Weight gain.

• #3 Folliculitis: Causes, Symptoms, and Treatment

  https://www.webmd.com/skin-problems-and-treatments/what-is-folliculitis

  Folliculitis is a skin problem that happens when you get bacteria or a blockage in a tiny pocket in your skin called a hair follicle. […] Staph bacteria is most often to blame. You have staph on your skin all the time, and it normally doesnt cause any issues. But if it gets inside your body, say through a cut, it can cause problems. […] These other things can also cause folliculitis: Blockages from skin products, such as moisturizers with oils, a fungus, hair removal, such as shaving, waxing, and plucking, ingrown hairs, other bacteria, such as the kind you might find in a hot tub, some drugs, such as corticosteroids that are used to ease inflammation. […] In general, youre more likely to get the condition if you have damaged follicles. This can happen from things such as shaving, skin injuries, sticky bandages, and tight clothes.

• #3 Folliculitis | Beacon Health System

  https://www.beaconhealthsystem.org/library/diseases-and-conditions/folliculitis?content_id=CON-20311566

  Folliculitis is often caused when hair follicles are infected with bacteria, commonly Staphylococcus aureus (staph). It may also be caused by viruses, fungi, parasites, medications or physical injury. Sometimes the cause isn’t known. […] When hair follicles are damaged, they may be invaded by viruses, bacteria and fungi. This can lead to development of folliculitis. […] Certain factors increase the risk of getting it, including: Regularly wearing clothing that traps heat and sweat, such as rubber gloves or high boots; Soaking in a hot tub, whirlpool or public pool that’s not maintained well; Causing damage to hair follicles through shaving, waxing, wearing tight clothes or hair styling practices such as traction, wigs and oils; Using some medications, such as corticosteroid creams, prednisone, long-term antibiotic therapy for acne and certain chemotherapy drugs; Having dermatitis or excessive sweating (hyperhidrosis); Having diabetes, HIV/AIDS or another condition that lowers your resistance to infections.

• #3 Folliculitis – Wikipedia

  https://en.wikipedia.org/wiki/Folliculitis

  Folliculitis is the infection and inflammation of one or more hair follicles. The condition may occur anywhere on hair-covered skin. […] Most carbuncles, boils, and other cases of folliculitis are infected with Staphylococcus aureus. Folliculitis starts with the introduction of a skin pathogen to a hair follicle. Hair follicles can also be damaged by friction from clothing, an insect bite, blockage of the follicle, shaving, or braids that are very tight and close to the scalp. The damaged follicles are then infected by Staphylococcus spp. […] Hot-tub folliculitis is caused by the bacterium Pseudomonas aeruginosa. […] Sycosis vulgaris, sycosis barbae, or barber’s itch is a staphylococcal infection of the hair follicles in the bearded area of the face, usually the upper lip. […] Gram-negative folliculitis may appear after prolonged acne treatment with antibiotics.

• #3 Folliculitis: Practice Essentials, Pathophysiology, Etiology

  https://emedicine.medscape.com/article/1070456-overview

  Folliculitis is a relatively common condition that arises due to an accumulation of inflammatory cells within the superficial or deep aspect of the hair follicle and has either an infectious or non-infectious etiology. […] The most common causes of folliculitis include: A. Infectious: bacterial, fungal, viral, parasitic, and folliculitis of secondary syphilis B. Non-infectious: Friction (acne mechanica), Occlusion, Drug induced, Inflammatory C. Idiopathic. […] Predisposing factors include: Altered immune status, Prior skin injury, Friction (acne mechanica) and other causes of minor follicular trauma (plucking, shaving, waxing, electrolysis, laser), Staphylococcal carrier status, Malnutrition, Diabetes, Obesity, Occlusion with topical products (paraffin or petrolum-based ointments, oils, grease, adhesive plasters), Use of certain medications (topical and systemic steroids, lithium, phenytoin, disulfiram, contraceptive agents, testosterone, danazol, stanozolol, antiepileptics, ethionamide, isoniazid, rifampicin, cyclosporin, sirolimus, epidermal growth factor receptor inhibitors, various targeted therapies to treat advanced melanoma, halogens (iodides and bromides), long-term use of antibiotics and occassionally excess vitamins (B1, B6, B12). […] Folliculitis has also been reported following smallpox or anthrax vaccine. These cases are more common in military troops who are vaccinated prior to being deployed. […] Poorly chlorinated hot tubs. […] Actinic damage.

• #3 Folliculitis: Causes, Symptoms, and Treatment – Skinsight

  https://skinsight.com/skin-conditions/folliculitis/

  Folliculitis is a skin condition caused by an inflammation of one or more hair follicles. […] In most cases of folliculitis, the inflamed follicles are infected with bacteria, especially with Staphylococcus (or staph) organisms, that normally live on the skin. Bacteria such as Pseudomonas may live in hot tubs, spas, and swimming pools and may also cause folliculitis. […] Further risk factors for folliculitis include: Diabetes. A suppressed immune system due to HIV, organ transplantation, or cancer. An underlying skin condition, such as eczema, acne, or another inflammation of the skin (dermatitis). Obesity. Frequent shaving. Pressure (eg, prolonged sitting on the buttocks). […] Occasionally, the bacteria causing the infection are resistant to treatment with the usual antibiotics. This can sometimes cause a more severe form of folliculitis.

• #3 Folliculitis

  https://dermnetnz.org/topics/folliculitis

  Eosinophilic folliculitis is a specific type of folliculitis that may arise in some immune-suppressed individuals such as those infected by human immunodeficiency virus (HIV) or those who have cancer. […] Folliculitis may be due to drugs, particularly corticosteroids (steroid acne), androgens (male hormones), adrenocorticotrophic hormone (ACTH), lithium, isoniazid (INH), phenytoin and B-complex vitamins. […] Certain uncommon inflammatory skin diseases may cause permanent hair loss and scarring because of deep-seated sterile folliculitis.

• #3 Folliculitis: Causes, Contagious, Symptoms & Treatment

  https://www.emedicinehealth.com/folliculitis/article_em.htm

  Folliculitis is an inflammation of the hair follicle, a structure composed of cells designed to produce hair. […] Causes of folliculitis include bacteria, fungi parasites, chemicals, and drugs. […] Infections by bacteria (Staphylococcus aureus for example), fungi (yeasts and dermatophytes), viruses (herpes simplex), and parasites (Demodex mites) can cause folliculitis. […] Noninfectious causes of folliculitis include topical irritants (insoluble cutting oils are an example), physical irritants (hair extraction), certain drugs, teenage pimples (acne vulgaris), and certain auto-inflammatory conditions (folliculitis decalvans). […] Exposure to potential infectious agents and certain types of occupational exposures can predispose to folliculitis. […] There is a well-known condition called „hot tub folliculitis” which can affect those who frequent poorly maintained hot tubs. […] A group of new anticancer drugs, epidermal growth factor receptor inhibitors, can produce a facial folliculitis.

• #3 Folliculitis: Causes, Symptoms, and Treatments

  https://piotrturkowski.pl/en/blog/folliculitis-on-the-head/

  Folliculitis is a bacterial infection that can spread quickly. […] For this reason, it is worth knowing what causes folliculitis and how it manifests itself, in order to start a treatment at the right time. […] Most often, it is the staphylococcus bacteria that causes persistent inflammation and can develop into fig. […] Keep in mind, that if folliculitis is ignored and treatment is not being started, complications such as boil and sycosis can occur. […] The treatment of folliculitis depends primarily on its cause. […] In case of a bacterial infection in the initial stage, antibiotics are used in the form of an ointment, which is applied topically to the resulting inflammation. […] If boils have already appeared, frequent skin disinfection and oral antibiotic therapy are also very important. […] As folliculitis takes time to heal, it is a good idea to rule out risk factors that will cause it to reappear.

• #4 Folliculitis: Causes, Symptoms, and Treatment

  https://www.webmd.com/skin-problems-and-treatments/what-is-folliculitis

  Folliculitis is a skin problem that happens when you get bacteria or a blockage in a tiny pocket in your skin called a hair follicle. […] Staph bacteria is most often to blame. You have staph on your skin all the time, and it normally doesnt cause any issues. But if it gets inside your body, say through a cut, it can cause problems. […] These other things can also cause folliculitis: Blockages from skin products, such as moisturizers with oils, a fungus, hair removal, such as shaving, waxing, and plucking, ingrown hairs, other bacteria, such as the kind you might find in a hot tub, some drugs, such as corticosteroids that are used to ease inflammation. […] In general, youre more likely to get the condition if you have damaged follicles. This can happen from things such as shaving, skin injuries, sticky bandages, and tight clothes.

• #4 Folliculitis, Boils, and Carbuncles | Cedars-Sinai

  https://www.cedars-sinai.org/health-library/diseases-and-conditions/f/folliculitis-boils-and-carbuncles.html

  Folliculitis, boils, and carbuncles are types of infections of one or more hair follicles. […] Bacteria called Staphylococcus aureus (staph) are the most common cause of these infections.

• #4 Pityrosporum Folliculitis: Causes, Symptoms, and Treatment

  https://www.webmd.com/skin-problems-and-treatments/what-is-pityrosporum-folliculitis

  Pityrosporum folliculitis is caused by a yeast called pityrosporum or malassezia. Pityrosporum is found on everyones skin. The yeast forms part of the skin flora, also known as the microbiome, and its completely normal. […] However, when it gets down into the hair follicles and multiplies, an itchy, acne-like eruption follows, called folliculitis. Its important to note that folliculitis is not contagious, infectious, or an indicator of poor skin hygiene. […] Since yeast grows in warm, moist environments, it tends to multiply in conditions that have plenty of humidity, perspiration, and heat. People who have systemic diseases like diabetes are also at risk.

• #4 Eosinophilic Folliculitis Clinical Presentation: History, Physical, Causes

  https://emedicine.medscape.com/article/217266-clinical

  Although production of cytokines and chemotactic factors and expression of intercellular adhesion molecules are evidence of activation of the follicular sebaceous unit, the stimuli that provoke these changes are unknown. The cause of classic eosinophilic pustular folliculitis is unknown, although immune processes almost certainly play a key role in its pathogenesis. […] Eosinophilic folliculitis may be associated with HIV infection, various drugs, and some lymphomas; it may be considered a nonspecific dermatopathologic pattern in such settings. […] Many observations suggest a role for immunologic, infectious, and environmental factors. […] Brenner et al described 3 cases of eosinophilic folliculitis associated with Pseudomonas infection of the hair follicles; the lesions improved with antipseudomonal treatment but recurred upon cessation of therapy.

• #5 Eosinophilic Folliculitis Clinical Presentation: History, Physical, Causes

  https://emedicine.medscape.com/article/217266-clinical

  Other investigators have reported infectious associations, including dermatophyte infection, as well as infections due to larva migrans, Pityrosporum infection, retrovirus, and hepatitis C virus infection. […] A linkage with pregnancy has been observed. […] In addition, eosinophilic folliculitis has been associated with various medical conditions, including lymphoma, Szary syndrome, leukemia, myelodysplastic syndrome, atopy, cutaneous angiosarcoma, and polycythemia vera. […] Eosinophilic folliculitis may also develop following bone marrow and solid organ transplantation. […] It may be considered a reaction related to immune dysregulation. […] Eosinophilic folliculitis associated with wearing protective gear during the COVID-19 pandemic has been described.

• #6 What is eosinophilic folliculitis? Symptoms, causes, and more

  https://www.medicalnewstoday.com/articles/eosinophilic-folliculitis

  Eosinophilic folliculitis is a type of folliculitis where eosinophilic cells, or eosinophils, gather around the hair follicles. Eosinophils are a type of white blood cell, which fight infections and function within the immune system. They can build up in certain areas and cause inflammation. […] People with eosinophilic folliculitis have eosinophils around their hair follicles. However, experts are unclear about what initially causes this accumulation of eosinophils or the disease to progress. […] There is a link between HIV and eosinophilic folliculitis. The impact HIV has on the immune system or an underlying infection can lead to eosinophilic folliculitis.

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