Materiały źródłowe

• #1 Head Lice: What You Need to Know

  https://www.webmd.com/children/ss/slideshow-lice-overview

  Head lice are tiny six-legged insects that cling to your scalp and neck and feed on human blood. Each louse is only about the size of a sesame seed, so they can be hard to spot. Lice lay their eggs, called nits, on hairs near the scalp, so theyre even harder to see. A glue-like substance holds them in place. […] Spotting a live louse or nymph (a young louse) is often the only sign of an infestation. Seeing nits alone doesn’t confirm an infestation. Head lice don’t always cause discomfort. When symptoms do happen, the most common problem is itching. It may not start until weeks or even months after the lice move in. […] The itching from lice is caused by an allergic reaction to the bug bites. A lot of scratching may lead to sores or raw skin on the scalp. Its rare, but sores related to scratching can become infected. Call a doctor quickly if you notice signs of infection like red, swollen, or painful skin or tender lymph nodes in your neck.

• #2 Head lice – BAD Patient Hub

  https://www.skinhealthinfo.org.uk/condition/head-lice/

  Head lice are very common. They are small grey-brown insects that grow up to 3mm long. They cannot fly or jump; neither can they burrow into the scalp. They can affect anyone with long or short hair, no matter how clean the hair is. […] Head lice have to feed on human blood several times a day to survive, and their bites, saliva and faeces often make the scalp itchy. Some people may be unaware they have head lice as they do not experience any symptoms. This lack of itching does not mean that lice are not present, and the only way to be sure is by taking a careful look at the scalp. […] Repeated scratching of the scalp may cause an additional bacterial infection. In this case the scalp may also feel sore, crusty, and result in a raised temperature and feeling generally unwell. If this occurs, you should contact a healthcare adviser in case antibiotic treatment is required.

• #3 Head lice (nits) | Better Health Channel

  https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/head-lice-nits

  Head lice are small, wingless insects that live, breed and feed on the human scalp. They do not generally carry or transmit disease. […] Itchiness may not disappear immediately after treatment. Persistent itch without evidence of persistent infection is not a reason to repeat the treatment. There are other reasons why your scalp might feel itchy. […] Some people who have a head lice infestation do not itch. It is possible to have head lice and not feel the need to scratch your head. This means that absence of itch is not a reliable sign that you do not have head lice. […] If the initial treatments have failed and live lice are still being removed with the conditioner and comb treatment, see your doctor for a referral to a dermatologist for specialist treatment.

• #4 Head Lice (for Parents) | Nemours KidsHealth

  https://kidshealth.org/en/parents/head-lice.html

  With lice bites come itching and scratching. This is due to a reaction to the saliva (spit) of lice. But the itching doesn’t always start right away. It depends on how sensitive a child’s skin is to the lice. It might take weeks for kids with lice to start scratching. They may complain, though, of things tickling or moving around on their heads. […] Some kids have mild irritation from scratching, while others may get a bothersome rash. Scratching a lot can lead to a bacterial infection. Watch for swollen lymph nodes (glands) on the back or front of the neck, and red, tender skin that might have crusting and oozing. Doctors can treat a skin infection with an antibiotic.

• #5 How to Calculate How Long You’ve Had Lice

  https://www.healthline.com/health/determining-length-of-lice-infestation

  The number of nits and lice you have, along with where they are in their life cycle, can help determine how long youve had them. […] Head lice are parasitic insects that commonly live close to the scalp. While they dont spread disease, theyre an itchy, uncomfortable, and spreadable nuisance that can be difficult to get rid of. […] You dont usually start experiencing scalp itching when lice first arrive in your hair. […] You may not experience itching until about 4 to 6 weeks after lice exposure. This is because the lice take time to multiply and cause symptoms of itchiness. […] The itching reaction is usually due to your skin becoming sensitized to the saliva that lice release when feeding. […] If youve had lice before, youll likely have symptoms faster because your body is already sensitized to lice saliva.

• #6

  https://www.healthychildren.org/English/health-issues/conditions/from-insects-animals/Pages/signs-of-lice.aspx

  Itching on the areas where head lice are present is the most common symptom. However, it may take up to 4 to 6 weeks after lice get on the scalp before the scalp becomes sensitive to the lice saliva and begins to itch. Most of the itching happens behind the ears or at the back of the neck. Also, itching caused by head lice can last for weeks, even after the lice are gone. […] Head lice live about 28 days. They develop in 3 phases: egg (also called a nit), nymph, and adult louse. […] This cycle can repeat every 3 weeks if head lice are left untreated.

• #7

  http://www.idph.state.il.us/public/hb/hblice.htm

  The earliest and most common symptom of a head lice infestation is itching, particularly in the area behind the ears and at the nape of the neck. Intense scratching may lead to secondary bacterial infection. […] After incubating for seven to 10 days, the nits hatch and, after another 10 days, mature into adult head lice and the cycle begins again. […] Parents and guardians should check treated children for lice and nits daily for two or three weeks after treatment.

• #8 Signs and Symptoms of Lice – Lice Knowing You® – Seattle Lice Clinic

  https://liceknowingyou.com/blog/signs-and-symptoms-of-lice/

  Symptoms help to identify lice cases when the bugs are too hard to spot. […] What many people don’t realize is that only 60% of people with head lice actually itch. The itching comes from an allergy to the saliva in the lice bites, so people that aren’t allergic won’t experience the same itchy symptoms as those that are. […] This is perhaps the most obvious symptom. If you or your child is experiencing an unusually itchy head, lice could be the culprit. […] Lice particularly love the scalp, behind the ears and the nape of the neck, but they love hair so they can be found anywhere on the head. […] You can often see the lice eggs, commonly referred to as nits, on the hair shaft. They look like tiny white little grains of sand and are often mistaken for dandruff. […] If you notice nits on you or your child’s head, your focus should be on manually removing all nits and lice from the head.

• #9 Head Lice: Signs, Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/10824-head-lice

  Head lice are tiny, crawling insects that live in the hair on your head. They lay eggs and bite your scalp, making it itchy. Symptoms of head lice include: Itching (most common), Feeling like something in your hair is moving, Small bumps or sores from scratching, Difficulty sleeping, as head lice are most active at night. Head lice usually spread from person to person by direct contact. Adult lice lay eggs near your scalp and glue them to your hair. Five to 10 days later, the lice hatch. Over the next nine to 12 days, they’ll bite you several times to take a meal. They’ll grow into adults and lay more eggs, starting the cycle over again. With effective treatment, head lice can go away after two to three weeks. Sometimes, you might have to try a different kind of treatment if the first doesn’t work.

• #10 About Head Lice | Lice | CDC

  https://www.cdc.gov/lice/about/head-lice.html

  Symptoms include itching, tickling, or sores on your scalp. […] Itching (pruritus) is the most common symptom of head lice infestation. It is caused by an allergic reaction to louse bites. It may take four to six weeks for itching to appear the first time a person has head lice. […] Other symptoms may include the following: A tickling feeling or a sensation of something moving in the hair, Irritability and sleeplessness, Sores on the head caused by scratching, which can sometimes become infected with bacteria normally found on your skin. […] Nits take about a week (range 6-9 days) to hatch into nymphs (young lice). Nymphs look similar to adult lice but are very small (size of a pinhead); they take about seven days to mature into adult lice. […] Misdiagnosis of head lice infestation is common. Finding a live nymph (baby louse) or adult louse on the scalp or hair is the best way to diagnose a head lice infestation.

• #11 Head lice: MedlinePlus Medical EncyclopediaLock

  https://medlineplus.gov/ency/article/000840.htm

  Head lice are tiny insects that live on the skin covering the top of your head (scalp). Head lice may also be found in the eyebrows and eyelashes. […] Symptoms of head lice include: Very bad itching of the scalp, Small, red bumps on the scalp, neck, and shoulders (bumps may become crusty and ooze), Tiny white specks (eggs, or nits) on the bottom of each hair that are hard to get off. […] Having head lice causes intense itching but does not lead to serious medical problems. Unlike body lice, head lice never carry or spread diseases.

• #12 Lice – Symptoms and causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/lice/symptoms-causes/syc-20374399

  Head lice occur on the scalp and are easiest to see at the nape of the neck and over the ears. Small nits (eggs) resembling tiny pussy willow buds about the size of dandruff flakes are visible on hair shafts. […] Head lice feed on blood from the scalp. The female louse lays eggs (nits) that stick to hair shafts. […] Common signs and symptoms of lice include: Intense itching on the scalp, body or in the genital area. A tickling feeling from movement of hair. The presence of lice on your scalp, body, clothing, or pubic or other body hair. Adult lice may be about the size of a sesame seed or slightly larger. Lice eggs (nits) on hair shafts. Nits may be difficult to see because they’re very tiny. They’re easiest to spot around the ears and the nape of the neck. Nits can be mistaken for dandruff, but unlike dandruff, they can’t be easily brushed out of hair. Sores on the scalp, neck and shoulders. Scratching can lead to small red bumps that can sometimes get infected with bacteria. Bite marks, especially around the waist, groin, upper thighs and pubic area. […] Your child may have nits in his or her hair but may not develop a case of head lice. Some nits are empty eggs. However, nits that are found within 1/4 inch (6 millimeters) of the scalp typically should be treated even if you find only one to prevent the possibility of hatching.

• #13 Head Lice (for Parents) | Nemours KidsHealth

  https://kidshealth.org/en/parents/head-lice.html

  Head lice are a common problem, especially for kids. They spread easily from person to person, and sometimes are tough to get rid of. Their bites can make a child’s scalp itchy and irritated, and scratching can lead to infection. […] Even though they’re tiny, you can see head lice. Here’s what to look for: Lice eggs (nits). These look like tiny yellow, tan, or brown dots before they hatch. Lice lay nits on hair shafts close to the scalp, where the temperature is perfect for keeping warm until they hatch. Nits look a bit like dandruff, but aren’t removed by brushing or shaking them off. […] Adult lice are no bigger than a sesame seed and are grayish-white or tan. Nymphs are smaller and become adult lice about 12 weeks after they hatch. This life cycle repeats itself about every 3 weeks. Most lice feed on blood several times a day, and they can survive up to 2 days off the scalp.

• #14 Head lice | Pediculosis | MedlinePlus

  https://medlineplus.gov/headlice.html

  Head lice are tiny insects that live on people’s heads. Adult lice are about the size of sesame seeds. The eggs, called nits, are even smaller – about the size of a dandruff flake. Lice and nits are found on or near the scalp, most often at the neckline and behind the ears. […] The symptoms of head lice include: Tickling feeling in the hair, Frequent itching, which is caused by an allergic reaction to the bites, Sores from scratching. Sometimes the sores can become infected with bacteria, Trouble sleeping, because head lice are most active in the dark. […] A diagnosis of head lice usually comes from seeing a louse or nit. Because they are very small and move quickly, you may need to use a magnifying lens and a fine-toothed comb to find lice or nits.

• #15 Head Lice: Symptoms, Causes & Diagnosis | LiceDoctors | LiceDoctors

  https://www.licedoctors.com/blog/what-are-the-symptoms-of-lice

  When parents see their school-aged children scratching, they may wonder if this is one of the early symptoms of head lice. […] The primary indication of head lice is an itchy scalp. This common symptom tends to be centered around the nape of the neck, behind the ears, and in other dark and warm locations where the bugs can hide. In severe cases, the whole head may itch, including the scalp neck, and shoulders. […] Another of the many symptoms of head lice is irritability. This may come as a surprise to some, but it is a common symptom, especially for those who are particularly sensitive to the sensation of bugs crawling around on their head or to the lice bites. […] Itchiness from head lice at night and living in an agitated state can cause difficulty sleeping, which results in a person being more cranky than they may normally be.

• #16 Head Lice and Nits (Causes, Symptoms, and Treatment)

  https://patient.info/childrens-health/head-lice-and-nits

  Head lice are small insects that live in human hair and feed on blood from the scalp. Their eggs are called nits. […] Lice feed from the blood on your scalp, and it is the bites – and your skin’s reaction to the bites – which make you itch. […] Itchy scalp. Not all scalp itching is caused by head lice, and head lice don’t always cause an itch. Many people with head lice do not have any symptoms. However, an itchy scalp occurs in some cases. This is due to a skin reaction to the lice bites or saliva, not due to their biting as such, or their movement on your head. It can take about three months for an itch to develop after you are infested with lice. Therefore, you may not notice that you have head lice for a while and you may have passed them on to others by the time you are aware of them. Head lice do not wash off with normal shampoo. […] Rash on the scalp. Head lice do not usually cause any other medical problems. Very occasionally, the scratching can cause a rash on the scalp, and occasionally this can cause an infection. […] Swollen lymph glands. Glands in the neck can get bigger in response to this infection.

• #17 How to Calculate How Long You’ve Had Lice

  https://www.healthline.com/health/determining-length-of-lice-infestation

  You can usually expect this itching reaction to take place about 2 days after you get the infestation. […] Its also possible that you may never experience symptoms associated with lice. In this case, youll have to identify them by sight. […] If you see nits and small, moving lice, youve likely had lice for 1.5 to 2 weeks. […] If youre seeing a mixture of sizes of lice, you may have had an infestation for at least 2 weeks. If you have symptoms like itching along with a variety of lice stages, youve likely been living with lice for four to six weeks or possibly longer. […] Only see small nits over a quarter inch away from the scalp? Its probably an old infestation. […] Some symptoms that may indicate lice include: frequent tickling feeling in the hair, problems sleeping, as lice move mostly at night, rash on the back of the head, sores that develop over time due to scratching, unexplained itchy scalp, especially close to the nape of the neck. […] If you can see nits or lice, the amount and symptoms may indicate to you how long youve been infested.

• #18 Head lice infestation – Wikipedia

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

  Itching from lice bites is common. […] During a person’s first infection, the itch may not develop for up to six weeks. […] If a person is infected again, symptoms may begin much more quickly. […] The itch may cause problems with sleeping. […] The most common symptom is itching of the head, which normally worsens 3 to 4 weeks after the initial infestation. […] Itching may take 26 weeks to develop upon first infestation, and sooner in subsequent infestations. […] Many individuals do not experience symptoms. […] The presence of live lice indicates an active infestation while the presence of nits indicates a past or currently inactive infection with the potential to become active. […] The condition is diagnosed by finding live lice and unhatched eggs in the hair. […] The presence of nits alone, however, is not an accurate indicator of an active head louse infestation. […] Children with nits on their hair have a 3540% chance of also being infested with living lice and eggs.

• #19 Is it lice? Know the symptoms

  https://www.medicalnewstoday.com/articles/318001

  Head lice can infest the hair, eyelashes, and eyebrows, while pubic lice infest the pubic hair. […] Many people with head lice have no symptoms at all. Its impossible to diagnose head lice based on symptoms alone since the only symptom that matters is the presence of lice. […] However, experiencing the following symptoms suggests it is time to check the scalp: frequent unexplained itching of the head or scalp, redness or inflammation on the scalp or near the hairline, tiny red bumps or sores from scratching the scalp, difficulty sleeping or concentrating due to head itching. […] Seeing either lice or eggs indicates a head lice infestation since eggs inevitably hatch into adults. The only way to get rid of head lice is to kill both the living insects and the eggs they lay.

• #20 Head lice and nits

  https://www.nhs.uk/conditions/head-lice-and-nits/

  Head lice can make your head feel itchy. […] The only way to be sure someone has head lice is by finding live lice. […] You can do this by combing their hair with a special fine-toothed comb (detection comb). […] Lice and nits can be removed by wet combing. […] Head lice should die within a day. […] Some treatments need to be repeated after a week to kill any newly hatched lice.

• #21 Head Lice: Causes, Symptoms, and Treatment | Doctor

  https://patient.info/doctor/head-lice-pro

  Many infestations are totally asymptomatic. Presentation is usually when adult lice or nits have been seen. Others present with itching. […] Itching of the scalp is not sufficient to diagnose active infestation. Itching may not develop for several weeks or months after becoming infested and may persist for days to weeks after successful eradication of head lice. […] Nits alone are not sufficient to diagnose active head lice infestation because it is difficult to distinguish between dead and live eggs with the naked eye. […] A diagnosis of active head lice infestation can only be made if a live head louse is found.

• #22 Head Lice (Pediculosis) | Mass.gov

  https://www.mass.gov/info-details/head-lice-pediculosis

  Lice (singular louse) are tiny, wingless insects that survive by feeding on human blood. They cannot jump or fly, and they do not burrow under the skin. Adult head lice or their eggs (nits) are found in the hair and are most often found behind the ears and at the base of the neck. Head lice usually lay their eggs on strands of hair about 4 mm or ¼ of an inch from the scalp. […] A person who has head lice may feel itching caused by a reaction to the louse’s saliva and feces, but many children have no symptoms. […] Identification of a head lice infestation is usually made by detecting nits attached to the hair close to the scalp. Nits are tiny, grey, oval specks that do not come off the hair easily like a speck of dandruff would. […] Nits found within ¼ of an inch from the scalp usually mean the nits are alive and treatment is needed. If the nits are more than ¼ of an inch from the scalp, you should ask your doctor if treatment is necessary.

• #23 Head lice and nits

  https://www2.hse.ie/conditions/head-lice-nits/

  Head lice can make your head feel: […] like something is moving in your hair. […] The only way to be sure someone has head lice is by finding live lice or eggs. […] Eggs containing developing lice stick to the hair shafts near the scalp. […] Nits are empty egg cases left behind when the lice hatch. You will find them a little distance away from the scalp. […] Head lice should die within a day of treatment. […] You may need to repeat some treatments after a week to kill any newly hatched lice.

• #24 Life cycle of lice: Stages, how they spread, and more

  https://www.medicalnewstoday.com/articles/life-cycle-of-lice

  Having head lice is a common problem, especially among children, and they cause intense irritation and itching. Repeated scratching can break the scalp’s skin, leading to an infection. […] Many people with head lice have no symptoms at all. However, if others are experiencing the following symptoms, it could indicate head lice: frequent itching of the head or scalp, redness or inflammation on the scalp or near the hairline, tiny red bumps or sores from scratching. […] A louse has three stages in its life cycle. They begin as nits, hatch and become nymphs, and become full-sized adults within weeks. Their life cycle is fast, and they tend to reproduce quickly.

• #25 Head lice – UF Health

  https://ufhealth.org/conditions-and-treatments/head-lice

  Head lice are tiny insects that live on the skin covering the top of your head (scalp). Head lice may also be found in the eyebrows and eyelashes. […] Head lice infect the scalp and hair and can be seen at the nape of the neck and over the ears. Head lice spread easily and quickly but do not carry disease as other lice do. […] Symptoms of head lice include: Very bad itching of the scalp, Small, red bumps on the scalp, neck, and shoulders (bumps may become crusty and ooze), Tiny white specks (eggs, or nits) on the bottom of each hair that are hard to get off. […] Having head lice causes intense itching but does not lead to serious medical problems. Unlike body lice, head lice never carry or spread diseases. […] Head lice can live up to 30 days on a human. Their eggs can live for more than 2 weeks. […] Head lice spread easily, particularly among school children ages 3 to 11 years. Head lice are more common in close, overcrowded living conditions.

• #26 Head Lice: What They Are and How to Get Rid of Them | Ausmed

  https://www.ausmed.com/learn/articles/head-lice

  Head lice are commonly associated with itching on the scalp, neck and ears, which is caused by an allergic reaction to louse saliva. However, many people will not experience any itching, and its possible to have a lice infestation without knowing (Mayo Clinic 2022; KidsHealth 2023). […] Once a female louse has laid her first eggs on a new host, they will hatch after 7 to 10 days. From here, the nits will progress through their short life cycle consisting of three stages: egg, nymph and adult. The total lifespan of a louse is only 32 to 35 days, but after mating, each female can lay 3 to 10 eggs per day. These eggs will then hatch and continue the cycle (VIC DoH 2015). […] As long as there are living eggs or lice on a persons head, that individual is infectious to others (SA Health 2022).

• #27 Head lice & nits: children & teens | Raising Children Network

  https://raisingchildren.net.au/guides/a-z-health-reference/head-lice

  Head lice are tiny, wingless insects that live in human hair and feed on blood in the scalp. […] If your child has head lice, you might notice your child scratching, especially around the back of their neck and behind their ears. Scratching can make the scalp look scaly or cause crusty spots on the scalp. […] When you look closely at your child’s hair, you might see small, oval-shaped, white or brown-black nits attached to the root of the hair, near the scalp. […] You might also see live head lice. Live head lice move fast. To spot live lice, you might have to part your child’s hair very quickly or use the wet-combing treatment described below. […] A bad case of head lice can lead to itchy dermatitis on the scalp, crusted sores, which can become infected by bacteria, and enlarged lymph nodes in the neck.

• #28 Head lice – BAD Patient Hub

  https://www.skinhealthinfo.org.uk/condition/head-lice/

  An affected scalp carries a mixture of the following: Eggs containing developing lice firmly stuck to the hair shafts near to the scalp. They are grey or brown and the size of a pin head. They take 7-10 days to hatch. New lice will then lay more eggs 7-10 days after they hatch. […] Other features of a head lice infestation can include: Scratch marks. A sticky, crusty or weeping scalp. This is usually a sign of an additional bacterial infection (impetigo). Small itchy bumps around the hair line particularly on the back of the neck. Enlarged glands, which will feel like firm lumps beneath the skin in the neck. […] Head lice should be considered in anyone who has an itchy scalp, or who has repeated skin infections on or around their scalp. […] The diagnosis is made by identifying active head lice through careful examination of the scalp.

• #29 Head Lice: Overview, Treatment Options and Prevention | Nationwide Children’s Hospital

  https://www.nationwidechildrens.org/conditions/head-lice

  Lice are tiny bugs that can live on your head. Head lice is very common – anyone can get it. It may cause some itching, but is usually easy to treat. […] They make the head itchy by feeding on blood from the scalp. […] Lice lay eggs (nits) on pieces of hair, close to the scalp. […] Your child’s doctor or health care provider can recommend a shampoo, rinse, or lotion to kill lice or help with itching. […] After using the medicine, check for lice again in 8 to 12 hours. […] Keep checking hair and using the nit comb every 2 to 3 days for 2 to 3 weeks. […] The comb-out method lets you check for nits and lice or remove them after treatment. […] After each medicine treatment, use the comb-out method every 2 to 3 days for 2 to 3 weeks to remove nits and eggs. […] Call your child’s doctor or health care provider if they have: A fever over 100.4F (38C). […] Been treated, but the lice are still active. […] Open, oozing sores or crusting on their scalp. […] Swollen lymph nodes in their neck.

• #30 Head Lice (for Teens) | Nemours KidsHealth

  https://kidshealth.org/en/teens/head-lice.html

  Head lice are a common problem, especially for little kids. But teens can get them too. They spread easily from person to person, and sometimes are tough to get rid of. Their bites can make the scalp itchy and irritated, and scratching can lead to infection. […] Besides seeing nits or lice on the head, itching or the feeling of something moving around on the scalp is another clue that you might have lice. Like mosquito bites, the itching is a reaction to the saliva of the insect. Some people with lice also get a rash of small red bumps from scratching. […] If you still have lice 2 weeks after you started treatment, let your doctor know. Your doctor may want to try a different medication or repeat treatment in case any nits were left behind and hatched after treatment. […] Scratching a lot can lead to a scalp infection. Call your doctor as soon as possible if: the skin on your scalp is red and tender; your scalp has crusting and oozing; you have swollen lymph glands.

• #31 What Does Lice Look Like? Pictures of Nits, Eggs & Lice

  https://www.verywellhealth.com/lice-lice-pictures-4020374

  Lice can look like dandruff or other conditions of the scalp. Identifying head lice often depends on spotting the nits (eggs), which look like tiny yellow, tan, or brown spots stuck on the hair shaft near the scalp. […] Lice eggs take around six to nine days to hatch. After that, it only takes about seven days for baby lice (nymphs) to grow into adult lice and start the cycle over again. Lice have a lifespan of three to four weeks. […] Continuing to get new nits even after you have removed them from your child’s hair is also a sign that your child has live lice and needs lice treatment. […] Live lice can be difficult to spot. The texture, color, and thickness of your child’s hair can also make it harder to spot lice. […] If you spot lice eggs in your child’s hair, go ahead and pick them out. If they have live adult lice, you’ll need to use a prescription or over-the-counter (OTC) treatment to kill them. You may need to repeat these steps until all the lice are gone.

• #32 Head lice and nits | NHS inform

  https://www.nhsinform.scot/illnesses-and-conditions/skin-hair-and-nails/head-lice-and-nits/

  Head lice can be difficult to spot, even when the head is closely inspected. […] Theyre very small whitish or grey-brown insects that range from the size of a pinhead to the size of a sesame seed. […] Less reliable signs of head lice include: small white eggs or nits (egg cases) in the hair behind the ears or at the back of the neck, an itchy scalp, a rash on the back of the neck, feeling as though something is moving in the hair. […] Detection combing can be carried out on dry or wet hair. […] Detection combing should usually be done 2 or 3 days after finishing treatment, and again another 7 days after that, to check for any live head lice.

• #33 Head lice – BAD Patient Hub

  https://www.skinhealthinfo.org.uk/condition/head-lice/

  Yes, but this is not always easy as some lice are now resistant to the insecticides used to treat them, and repeated infestations are common. […] Treatment is needed only when an active louse infestation is present; as shown by the presence of living and moving lice. Neither itching by itself, nor evidence of an old infestation (only empty egg cases), is a reason for starting treatment. […] There are several reasons why symptoms may not improve after treatment: The diagnosis of head lice infestation may have been incorrect. You may not have followed the treatment instructions correctly or repeated the treatment at the correct intervals. The lice may have been resistant to the chosen treatment. You may have picked up a new infestation immediately after the treatment finished. […] After the treatment is complete you should check every week, for a month, to ensure the infestation has cleared.

• #34 Head lice & nits: children & teens | Raising Children Network

  https://raisingchildren.net.au/guides/a-z-health-reference/head-lice

  These symptoms aren’t common, and your child can avoid them if you treat their head lice as soon as possible. […] You should also see your GP if your child is scratching a lot and it interrupts their sleep, has sores on their scalp, or has been treated 3 or more times in a year. […] Treatment doesn’t always work, especially the first time you do it. […] Some children get head lice several times each year. This can be very upsetting for your child and for you.

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