Materiały źródłowe

• #1 Spider bites – Diagnosis & treatment – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/spider-bites/diagnosis-treatment/drc-20352377

  Spider bites can be mistaken for other skin sores that are red, painful or swollen. […] Your doctor will likely diagnose a spider bite based on your history and your signs and symptoms. The process might involve determining whether anyone saw a spider bite you, having an expert identify the spider, and ruling out other possible causes of the signs and symptoms.

• #1 Spider bite – Wikipedia

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

  A reliable diagnosis of spider bites requires three conditions: first, there should be clinical effects of the bite at the time or soon afterwards, although there are no symptoms universally diagnostic of a spider bite, and bites by some spiders, e.g. Loxosceles species, may initially be painless; second, the spider should be collected, either at the time of the bite or immediately afterwards; and third, the spider should be identified by an expert arachnologist. […] Spider bites are commonly misdiagnosed. A review published in 2016 showed that 78% of 134 published medical case studies of supposed spider bites did not meet the necessary criteria for a spider bite to be verified. In the case of the two genera with the highest reported number of bites, Loxosceles and Latrodectus, spider bites were not verified in over 90% of the reports. Even when verification had occurred, details of the treatment and its effects were often lacking.

• #1 Spider Bites (Venomous spider bites) – Dermatology Advisor

  https://www.dermatologyadvisor.com/home/decision-support-in-medicine/dermatology/spider-bites-venomous-spider-bites/

  The effects of black widow envenomation can mimic a number of other disease states. […] The most characteristic lesion of a recluse spider bite, the dermonecrotic lesion, may be simulated by a multitude of other cutaneous and systemic diseases. […] Studies have shown that most clinically diagnosed recluse bites are erroneous. […] A recent study found that almost 90% of patients presenting to the emergency room with a lesion attributed to a spider bite turned out to have a soft tissue infection. Only 3.8% of patients actually had confirmed spider bites. […] Care should be taken to correctly diagnose ulceronecrotic lesions if there is no reliable history of spider bite. A diagnosis of brown recluse spider bite should be made with certainty only if the offending spider is caught and identified by a reliable source.

• #1 Spider Bites: Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/16639-spider-bites

  Spider bite symptoms vary depending on the type of spider. […] Black widow spider bites cause an immediate, sharp, pinprick-like pain. The bite area then becomes numb. Other signs of a black widow spider bite include: […] Brown recluse spider bites aren’t immediately painful or noticeable. Instead, you might feel pain an hour after the bite. Other signs of a brown recluse spider bite include: […] Hobo spider bites rarely cause pain. Signs of a hobo spider bite include: […] Seeing the spider is the best way to confirm both a bite and the type of spider. Otherwise, there isn’t a way to test for a spider bite or determine what bit you. […] Your healthcare provider may make a diagnosis based on your symptoms. Your provider may also send a sample of fluid from a blister to a lab to check for skin infections that cause similar symptoms, such as methicillin-resistant staphylococcus aureus (MRSA).

• #1 Spider bites – Symptoms & causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/spider-bites/symptoms-causes/syc-20352371

  Spider bites can cause redness, pain and swelling, or you might not notice them at all. […] So unless you actually saw a spider bite you, it’s difficult to be certain that your wound was caused by a spider. […] Bites from some spiders, such as widow spiders and recluse spiders, might cause serious signs and symptoms. […] Signs and symptoms of a widow spider bite can include: Redness, pain and swelling. You might have pain and swelling around the bite, which can spread into your abdomen, back or chest. […] You might have severe abdominal rigidity or cramping, which is sometimes mistaken for appendicitis or a ruptured appendix. […] You might experience nausea, vomiting, tremors or sweating alone or in combination. […] Symptoms can last 1 to 3 days. […] Signs and symptoms of a recluse spider bite can include: Increasing pain over the first eight hours after the bite.

• #1 Symptoms of Spider Bites & Diagnosis | WoundEducators.com

  https://woundeducators.com/spider-bites-symptoms-and-diagnosis/?srsltid=AfmBOoobmbs_QsbIZpxr2eaJs9A8BHUJowVjbG-nQDBtgP1zEsEtedFw

  In contrast, the bite wound from the brown recluse spider can lead to local edema, vasodilatation, blood vessel degeneration, and hemorrhage. Within 24 hours, the brown recluse spider bite presents with a characteristic red inflammation, blue thrombosis, and white ischemia. In about 20% of cases, this leads to a centrally necrotic area, progressing to eschar. Systemic effects include fever, nausea, malaise, joint pain, seizures, hemolysis, and thrombocytopenia. In rare cases, the bite may lead to renal failure and death.

• #1 Spider bites

  https://dermnetnz.org/topics/spider-bite

  The signs and symptoms of a spider bite depend on many factors, these include: […] The signs and symptoms from a bite from a spider with neurotoxic venom differ to those produced by a spider with cytotoxic venom. The severity of the symptoms depends on the species of the spider as the symptoms of bites from different species of Loxosceles can range from unremarkable (requiring no care), localised (usually self-healing), dermonecrotic (slow-healing ulcerated lesion requiring treatment), to systemic (vascular, renal damage and sometimes life-threatening). […] Although many people attribute an episode of bacterial infection (especially cellulitis and necrotising fasciitis) to an unseen spider bite, they are falsely blamed. Documented spider bites have not led to skin these infections. […] One of the most important aspects in treating spider bites it to try and identify the offending spider. The venom of spider bites is quite variable hence identification of the spider can be of value in determining the management of the condition. […] Specific treatment for bites from certain spiders include: Antivenin is available for bites by spiders of the Latrodectus and Loxosceles genera and is very effective if given soon after the bite.

• #1 Brown Recluse and Black Widow Spider Bites in Children

  https://www.nationwidechildrens.org/conditions/health-library/brown-recluse-and-black-widow-spider-bites-in-children

  Most spider bites cause only minor, local reactions. But some spider bites can be deadly. […] The 2 spiders that can cause serious problems are the black widow and the brown recluse. […] Venom from the brown recluse spider often causes local tissue damage. […] Black widow spiders release a toxin. This can harm your child’s central nervous system. […] If your child is bitten by a spider, get medical help right away. You can call the Poison Control hotline at 800-222-1222 for advice over the phone if your child is stable. […] Your child’s healthcare provider will look at the bite area and check your child for other symptoms of a bite. They will also ask if your child was recently in an area where spiders are often found. […] The symptoms of a brown recluse spider bite may look like other health problems. Make sure your child sees their healthcare provider for a diagnosis. […] The symptoms of a black widow spider bite may look like other health problems. Make sure your child sees their healthcare provider for a diagnosis.

• #1 Spider Bites: Diagnosis and Treatment | ABC Medical Center

  https://centromedicoabc.com/en/padecimientos/spider-bites/

  If you are not sure that a spider bit you, the doctor, when analyzing your symptoms and observing the injury, may infer that it is a spider bite, but if you saw the insect in question, you should describe it to identify the specimen. […] When the symptoms are severe and can be fatal, the intravenous application of an antidote for black widow bites is required, but it is used at the doctors discretion as it is high risk due to possible allergic reactions.

• #1 Get a Spider Bite? Here’s What You Need to Know

  https://www.webmd.com/skin-problems-and-treatments/what-to-know-about-spider-bites

  Spider bites look a lot like other bug bites and infections. To identify the cause of your sore, your doctor will ask about your symptoms and how you were bitten. Theyll want to know if you saw a spider bite you, and if you did, what the spider looked like. (It might help to bring a photo of the spider that bit you.) Thats really the only way they can know for sure that its a spider bite. […] If you have more than one bite on different parts of your body, or if several people in your house were also bitten, a spider is probably not to blame. In this case, your doctor will examine you to rule out other causes, like an infection or vasculitis (a condition that causes blood vessels to swell). They may take a sample of fluid from your sore to test for infections like methicillin-resistant staphylococcus aureus (MRSA).

• #1 Brown Recluse Spider Toxicity – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK537045/

  If the clinician makes a working diagnosis of a brown recluse spider bite, lab testing is unnecessary except if there are systemic complaints, especially in children. In these patients the following laboratory studies are performed; CBC, BMP, Serum calcium and phosphate, LFT, CK/myoglobin, Reticulocyte count, Haptoglobin, LDH, PT/ INR, D Dimer, Fibrinogen. […] In the event of a spider bite, the best course is to see a doctor on the same day. If possible, bring the spider, as this will help with a definitive diagnosis. Lab tests are not necessary if the patient only has skin complaints, but if there are systemic complaints like fever, headache, or muscle pain, the provider may order a complete blood count, electrolyte panel, check coagulation studies, kidney function, and urinalysis.

• #1 Common Spider Bites | AAFP

  https://www.aafp.org/pubs/afp/issues/2007/0315/p869.html

  Local wound care of Latrodectus bites should include thorough wound cleansing and ice pack application. Other treatments include oral or parenteral analgesics, benzodiazepines for muscular spasm and rigidity, and tetanus prophylaxis. […] In severe cases, the initial laboratory evaluation should include complete blood count and urinalysis to rule out peritonitis and urinary tract infections, and measurement of serum creatine phosphokinase and lactic dehydrogenase to detect rhabdomyolysis from muscular spasm and rigidity. […] Most Loxosceles bites in humans occur in the early morning; bites cluster wherever bed linens, bedclothes, or other garments squeeze the female spider between fabric and the victim’s skin, particularly under the arms, at the waist, or on the lower extremities under socks, stockings, or pants. Immediate wound care should include thorough cleansing, cold compresses, elevation of the bitten extremity, immobilization, oral or parenteral analgesics and antihistamines, and tetanus prophylaxis. […] Hyperbaric oxygenation has been recommended to reverse the expanding dermonecrosis of loxoscelism, but it has shown mixed treatment outcomes and is not supported by controlled trials.

• #1 Spider Bites

  https://healthlibrary.methodisthealthsystem.org/Library/DiseasesConditions/Adult/Spine/85,P00860

  Most spiders found in the U.S. are harmless, except for the brown recluse and the black widow spiders. […] A spider bite is diagnosed based on your history and your symptoms. A definite diagnosis of a spider bite needs all of these: […] Many of the symptoms of a brown recluse spider bite and a black widow spider bite may be caused by other health problems. Always see your healthcare provider for a diagnosis. […] In most cases, a spider bite is not the cause of the symptoms. […] Brown recluse spider bites are often diagnosed by mistake. […] Quick treatment of both types of spider bites is key to preventing more serious complications, especially in children.

• #1 UC San Diego Health Health Library | San Diego Hospital, Healthcare

  https://myhealth.ucsd.edu/BreatheEasy/85,P00860

  Most spiders found in the U.S. are harmless, except for the brown recluse and the black widow spiders. […] A spider bite is diagnosed based on your history and your symptoms. A definite diagnosis of a spider bite needs all of these: […] Many of the symptoms of a brown recluse spider bite and a black widow spider bite may be caused by other health problems. Always see your healthcare provider for a diagnosis. […] Brown recluse spider bites are often diagnosed by mistake. They are often diagnosed in areas that dont have recluse spiders. […] Prompt treatment of both types of spider bites is key to preventing more serious complications, especially in children.

• #1 Spider Bites

  https://healthlibrary.uwmedicine.org/Library/TestsProcedures/85,P00860

  Most spiders found in the U.S. are harmless, except for the brown recluse and the black widow spiders. […] A spider bite is diagnosed based on your history and your symptoms. A definite diagnosis of a spider bite needs all of these: […] Always see your healthcare provider for a diagnosis. […] In most cases, a spider bite is not the cause of the symptoms. […] Brown recluse spider bites are often diagnosed by mistake. […] Quick treatment of both types of spider bites is key to preventing more serious complications, especially in children.

• #1 Diagnosis of Brown Recluse Spider Bites Is Overused | AAFP

  https://www.aafp.org/pubs/afp/issues/2007/1001/p943.html

  Spider bites do occur, but they are the exception, not the rule. […] Many patients currently present with a spider bite, but on investigation they have community-acquired methicillin-resistant Staphylococcus aureus (MRSA). […] A working diagnosis of spider bite or publishing a case history should be considered only when a spider is caught in the act of biting or otherwise reliably associated with a lesion. […] When cultured, my patients’ spider bites invariably grow out as MRSA. […] The differential diagnosis of necrotic arachnidism, often incorrectly ascribed to recluse or Loxosceles species spider bites in the United States, is extensive and includes most dermonecrotic lesions, from boils and furuncles to tick bites to topical medication reactions. […] Two reports have found that the diagnosis of brown recluse (Loxosceles reclusa) bites is widely overused.

• #1 SciELO Brazil – Spider bites of medical significance in the Mediterranean area: misdiagnosis, clinical features and management Spider bites of medical significance in the Mediterranean area: misdiagnosis, clinical features and management

  https://www.scielo.br/j/jvatitd/a/wQrfMGpmjygxpVBGSsFDgRp/

  Misdiagnosing a dermonecrotic wound as a spider bite can lead to delays in appropriate care and cause adverse or even fatal outcomes. […] Although general wound care may be sufficient for most wounds, it is ineffective for some conditions, such as Lyme disease, necrotizing fasciitis, cutaneous neoplasms and cutaneous anthrax, all of which need a specific treatment. […] Concerningly, misinformation on spider bites also affects the medical literature. […] The general management and treatment of any unknown spider bite should be conservative and aimed at easing the symptoms. […] In cases of a suspect of spider bite, a conservative treatment based on wound cleansing, elevation of the bitten extremity, application of cool compresses, tetanus prophylaxis and administration of analgesics and antihistamines should be executed.

• #1 Spider bites – Symptoms & causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/spider-bites/symptoms-causes/syc-20352371

  Seek medical care immediately if: You were bitten by a dangerous spider, such as a widow or recluse. […] You’re unsure whether the bite was from a dangerous spider. […] You have severe pain, abdominal cramping or a growing wound at the bite site. […] Severe spider bite symptoms occur as a result of the venom that the spider injects. Symptom severity depends on the type of spider, the amount of venom injected and how sensitive your body is to the venom. […] Rarely, a bite from a widow spider or recluse spider is deadly, particularly in small children. […] A severe wound from a recluse spider can take weeks or months to heal and leaves large scars.

• #1 What to Do About Spider Bites (for Parents) | Nemours KidsHealth

  https://kidshealth.org/en/parents/spider-bites-sheet.html

  Most spider bites don’t go all the way through skin, so they usually cause only mild reactions. But a bite from a black widow spider or brown recluse spider can cause serious reactions and needs medical care right away. […] If someone in your family might have a bite from a brown recluse spider or black widow spider, call the National Poison Control Center at 1-800-222-1222. Because spider bites contain venom, which is a type of poison, poison control is an expert resource. It’s available for free, 24 hours a day. […] Get Medical Care Right Away for a Spider Bite if: Your child has any signs of an allergic reaction. Your child develops any kind of rash after a bite. Your child has severe pain or cramping. The area begins to look infected (increasing redness, pain, swelling, warmth, or pus). You think your child was bitten by a brown recluse spider or black widow spider. Even without symptoms, have your child seen right away. Early treatment can help ease symptoms.

• #1 How to Identify and Treat Spider Bites

  https://www.everydayhealth.com/bug-bites/spider-bites/

  If you suspect black widow or brown recluse spider bite either because you actually felt and saw the spider, or you’re experiencing the above symptoms head to the emergency room. […] If your spider bite isn’t causing any internal symptoms, or you’re sure it wasn’t a black widow or brown recluse that bit you, Dr. Day recommends these steps: Clean the bite with soap and water. Swab the bite with alcohol to prevent infection. Apply ice or a cold compress to keep the swelling down. […] If pain or itching develops at the bite site, taking OTC pain meds or antihistamines for relief is fine. But if pain spreads beyond the bite site, or if the swelling, inflammation, or redness are getting worse even a day or two after the bite occurs, get medical attention. […] If you suspect you were bitten by a black widow or brown recluse spider, or if the bite is causing internal symptoms, go to the emergency room. If the bite is not causing internal symptoms, but the pain, swelling, or redness worsens, go to a doctor or urgent care center.

• #1 Spider Bites: Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/16639-spider-bites

  Spider bite treatment will vary depending on your symptoms and the type of spider that bit you. […] Treatment for black widow spider bites may include: […] Treatment for brown recluse and hobo spider bites include: […] You should never attempt to suck out or remove venom from a spider bite. Instead, follow these steps: […] Most people with spider bites experience mild symptoms like pain and swelling. These symptoms gradually go away with at-home care. […] You may have more painful and severe symptoms if a black widow, brown recluse or hobo spider bites you. With proper medical care, most people recover from venomous spider bites. […] You should call your provider if you experience: […] If you have concerns about a spider bite, you may want to ask your healthcare provider: […] You should seek immediate medical attention if a black widow, brown recluse or hobo spider bites you, or if you’re noticing symptoms of these bites, as most people who get bitten don’t see the spider.

• #1 What Should I do if I Get a Spider Bite? – familydoctor.org

  https://familydoctor.org/spider-bites/

  Your doctor may prescribe an antibiotic to kill an infection from the bite. They may give you a tetanus shot if you haven’t had one in the past 5 years. […] Seek emergency treatment right away if you have any of the following symptoms. They may mean you’re having a severe allergic reaction: Fast heart rate, Trouble breathing or swallowing, Tightness in your chest, Swelling in your mouth or face. […] Young children and older adults are at higher risk of complications from spider bites. It is more likely they will need to be seen by their family doctor after a possible bite. […] If you see the spider that bit you, take it with you to your doctor. It’s okay if it’s dead. Taking it will let your doctor identify the spider and know how to best treat your bite. […] Two spiders in the United States have venom that can cause severe skin and health issues. Venom is a fluid that spiders put into their victims when they bite them. This venom is what causes a reaction in your body. The two poisonous spiders that live in the U.S. are the black widow and the brown recluse.

• #1 Spider Bites: Identify What Bit You and Get Proper Help

  https://www.healthline.com/health/spider-bites

  Always seek medical attention if you suspect one of the following species has bitten you: brown recluse, black widow, hobo spider, tarantula, Brazilian wandering spider. […] The initial brown recluse bite may be painless, but within 28 hours, it’ll begin to itch, hurt, and turn red. A red or purple ring resembling a target or bulls-eye will develop around the bite. […] The bite can blister and grow progressively worse without treatment to the point where it may kill surrounding tissue and cause fever, chills, and headache. […] There’s no antidote for a brown recluse bite, but keeping the area clean can encourage faster healing. Your doctor will examine the bite and prescribe antibiotics. People who experience tissue death may need surgery and time in the hospital. […] Black widow bites can feel like a small pinprick or nothing at all, but your skin’s reaction will be immediate. You’ll be able to see the two puncture marks on your skin.

• #1 Black Widow Spider Bite Treatment

  https://my.clevelandclinic.org/health/diseases/black-widow-spider-bite

  A female black widow spider bite can be dangerous. If you think a black widow bit you, seek medical care right away. […] Healthcare providers cant identify a particular spider based on its bite mark. There are no tests to confirm what kind of spider bit you. Providers usually diagnose a spider bite based on your symptoms. […] If you think a black widow spider bit you: Wash the area with soap and water. Apply an ice pack to help reduce pain and swelling and to delay the effects of the venom. […] Treatment for a black widow spider bite may include: Muscle relaxers and sedatives, to help relieve muscle pain and spasms. Analgesics, to help reduce pain. Antivenom, to help reverse the effects of the venom, including bodywide muscle cramping. […] The prognosis for black widow bites is generally good. With prompt treatment, you should make a full recovery within 24 to 48 hours. Some people experience long-term pain or muscle spasms after black widow bites, but this is rare. […] You should seek immediate medical attention if a black widow spider bites you.

• #1 Diagnostic approach to the patient with a suspected spider bite: An overview – UpToDate

  https://www.uptodate.com/contents/diagnostic-approach-to-the-patient-with-a-suspected-spider-bite-an-overview

  Diagnostic approach to the patient with a suspected spider bite: An overview […] The spiders of medical importance, an overview of the clinical manifestations of their bites, and diagnosis and differential diagnosis of spider bites will be reviewed here. […] Spider bites are rare medical events. Of the thousands of spider species that exist around the world, only a handful cause problems in humans. […] The spiders most likely to inflict medically significant bites in humans include widow and false black widow spiders, recluse spiders, Australian funnel web spiders, and Phoneutria spiders. […] Widow bites cause unremarkable local lesions that are sometimes accompanied by a characteristic systemic reaction with prominent, proximally-spreading severe pain and localized diaphoresis surrounding the site of the bite.

• #1 SciELO Brazil – Spider bites of medical significance in the Mediterranean area: misdiagnosis, clinical features and management Spider bites of medical significance in the Mediterranean area: misdiagnosis, clinical features and management

  https://www.scielo.br/j/jvatitd/a/wQrfMGpmjygxpVBGSsFDgRp/

  Spider bites have no pathognomonic signs or symptoms, therefore most diagnoses are presumptive; a spider bite can only be diagnosed when a spider (seen at the time of the bite) is collected and identified by an expert, since most physicians and patients are unable to recognize a certain spider species or distinguish spiders from other arthropods. […] Misdiagnosing a wound as a spider bite can lead to delays in appropriate care, cause adverse or even fatal outcomes and have medical-legal implications. […] The habit of attributing skin lesions of uncertain etiology to spider bites is not limited to Italy or the modern age and is popular among healthcare professionals too, probably because of the countless myths surrounding these animals and their classic association with horror in movies and novels, which also contributed to making arachnophobia widespread. Spider bites have no pathognomonic signs or symptoms; therefore, most diagnoses are presumptive.

• #1 Spider Bites

  https://healthlibrary.gradyhealth.org/Library/TestsProcedures/Urology/85,P00860

  Most spiders found in the U.S. are harmless, except for the brown recluse and the black widow spiders. […] A spider bite is diagnosed based on your history and your symptoms. […] In most cases, a spider bite is not the cause of the symptoms. […] Always see your healthcare provider for a diagnosis. […] Brown recluse spider bites are often diagnosed by mistake. […] Quick treatment of both types of spider bites is key to preventing more serious complications, especially in children.

• #2 Spider Bites: Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/16639-spider-bites

  Spider bite symptoms vary depending on the type of spider. […] Black widow spider bites cause an immediate, sharp, pinprick-like pain. The bite area then becomes numb. Other signs of a black widow spider bite include: […] Brown recluse spider bites aren’t immediately painful or noticeable. Instead, you might feel pain an hour after the bite. Other signs of a brown recluse spider bite include: […] Hobo spider bites rarely cause pain. Signs of a hobo spider bite include: […] Seeing the spider is the best way to confirm both a bite and the type of spider. Otherwise, there isn’t a way to test for a spider bite or determine what bit you. […] Your healthcare provider may make a diagnosis based on your symptoms. Your provider may also send a sample of fluid from a blister to a lab to check for skin infections that cause similar symptoms, such as methicillin-resistant staphylococcus aureus (MRSA).

• #2 Content – Health Encyclopedia – University of Rochester Medical Center

  https://www.urmc.rochester.edu/encyclopedia/content?ContentTypeID=85&ContentID=P00860

  Most spiders found in the U.S. are harmless, except for the brown recluse and the black widow spiders. […] A spider bite is diagnosed based on your history and your symptoms. A definite diagnosis of a spider bite needs all of these: You saw the spider bite your skin. The spider was captured and correctly identified by someone who is an expert on insects (entomologist). There is a skin sore lesion or you have overall (systemic) physical symptoms related to the spider bite. Any other conditions that could also cause the physical symptoms have been ruled out. […] Many of the symptoms of a brown recluse spider bite and a black widow spider bite may be caused by other health problems. Always see your healthcare provider for a diagnosis. […] In most cases, a spider bite is not the cause of the symptoms. Such things as infections, bites and stings of other insects, and common skin conditions and infections can cause the symptoms. Brown recluse spider bites are often diagnosed by mistake. They are often diagnosed in areas that dont have recluse spiders.

• #2 Get a Spider Bite? Here’s What You Need to Know

  https://www.webmd.com/skin-problems-and-treatments/what-to-know-about-spider-bites

  Spider bites look a lot like other bug bites and infections. To identify the cause of your sore, your doctor will ask about your symptoms and how you were bitten. Theyll want to know if you saw a spider bite you, and if you did, what the spider looked like. (It might help to bring a photo of the spider that bit you.) Thats really the only way they can know for sure that its a spider bite. […] If you have more than one bite on different parts of your body, or if several people in your house were also bitten, a spider is probably not to blame. In this case, your doctor will examine you to rule out other causes, like an infection or vasculitis (a condition that causes blood vessels to swell). They may take a sample of fluid from your sore to test for infections like methicillin-resistant staphylococcus aureus (MRSA).

• #2 Spider bite – Wikipedia

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

  Unverified bite reports likely represent many other conditions, both infectious and non-infectious, which can be confused with spider bites. Many of these conditions are far more common and more likely to be the source of necrotic wounds. An affected person may think that a wound is a spider bite when it is actually an infection with methicillin-resistant Staphylococcus aureus (MRSA). False reports of spider bites in some cases have led to misdiagnosis and mistreatment, with potentially life-threatening consequences.

• #2 Diagnosis of Brown Recluse Spider Bites Is Overused | AAFP

  https://www.aafp.org/pubs/afp/issues/2007/1001/p943.html

  Spider bites do occur, but they are the exception, not the rule. […] Many patients currently present with a spider bite, but on investigation they have community-acquired methicillin-resistant Staphylococcus aureus (MRSA). […] A working diagnosis of spider bite or publishing a case history should be considered only when a spider is caught in the act of biting or otherwise reliably associated with a lesion. […] When cultured, my patients’ spider bites invariably grow out as MRSA. […] The differential diagnosis of necrotic arachnidism, often incorrectly ascribed to recluse or Loxosceles species spider bites in the United States, is extensive and includes most dermonecrotic lesions, from boils and furuncles to tick bites to topical medication reactions. […] Two reports have found that the diagnosis of brown recluse (Loxosceles reclusa) bites is widely overused.

• #2 Spider bites – Symptoms & causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/spider-bites/symptoms-causes/syc-20352371

  Spider bites can cause redness, pain and swelling, or you might not notice them at all. […] So unless you actually saw a spider bite you, it’s difficult to be certain that your wound was caused by a spider. […] Bites from some spiders, such as widow spiders and recluse spiders, might cause serious signs and symptoms. […] Signs and symptoms of a widow spider bite can include: Redness, pain and swelling. You might have pain and swelling around the bite, which can spread into your abdomen, back or chest. […] You might have severe abdominal rigidity or cramping, which is sometimes mistaken for appendicitis or a ruptured appendix. […] You might experience nausea, vomiting, tremors or sweating alone or in combination. […] Symptoms can last 1 to 3 days. […] Signs and symptoms of a recluse spider bite can include: Increasing pain over the first eight hours after the bite.

• #2 Spider Bites – Causes, Symptoms, Treatment, Diagnosis – MedBroadcast.com

  https://medbroadcast.com/condition/getcondition/spider-bites

  Most spiders don’t bite humans and only do so if they’re provoked. […] However, there are a few venomous spiders in North America that can be dangerous. […] Many spiders bite, but very few are a risk to humans. […] The venom of black widow spiders is a neurotoxin (poisonous to the nervous system). […] The venom of brown recluse spiders causes necrosis (damage and breakdown) of skin and tissue. […] Most spider bites cause minor swelling, inflammation, and itching. However, bites from venomous spiders can cause more severe reactions. […] Black widow bites affect the nervous system. […] Brown recluse spider bites affect the skin and surrounding tissue. […] If a spider bites you, try to catch it and take it with you to the doctor. […] Treatment for spider bites varies according to the type of spider.

• #2 Brown Recluse Spider Toxicity – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK537045/

  Brown recluse spider bites usually occur while indoors and as a defense mechanism as they are crushed or rolled over in bed. Some bites will present with only an urticarial rash. If the bite is more severe, the course usually is as follows. The initial bite will be painless, but over the subsequent two to eight hours it will become increasingly painful. Systemic symptoms of brown recluse venom can present as malaise, nausea, headache, and myalgias. In children, the systemic reaction is more severe and may also include weakness, fever, joint pain, hemolytic anemia, thrombocytopenia, organ failure, disseminated intravascular coagulation, seizures, and death. […] The bite of a brown recluse spider bite is a clinical diagnosis. A diagnosis of a spider bite can be made definitively only if the patient has a lesion that is consistent with a spider bite, or the spider was seen biting the patient, and the spider is caught and identified by an entomologist.

• #2 Spider Bites (Venomous spider bites) – Dermatology Advisor

  https://www.dermatologyadvisor.com/home/decision-support-in-medicine/dermatology/spider-bites-venomous-spider-bites/

  Spider bites can cause myriad symptoms, ranging from a mild discomfort or burning to life-threatening systemic organ failure, hemolytic anemia, and death. […] Most species of spiders are not known to bite humans, and only a small portion of those species that do bite humans are known to cause serious disease. […] Diagnosis of spider bites relies heavily on the history of an actual bite being observed. Ideally, any spider that does bite should be captured (alive or dead) to allow for proper identification by a reliable expert. Misdiagnosis, mistreatment, and missed diagnosis can result unless the spider is caught in the act. […] Spider bite reactions may be simulated by a multitude of other cutaneous and systemic diseases and there are no specific tests that reliably diagnose spider bites.

• #2 What Should I do if I Get a Spider Bite? – familydoctor.org

  https://familydoctor.org/spider-bites/

  Your doctor may prescribe an antibiotic to kill an infection from the bite. They may give you a tetanus shot if you haven’t had one in the past 5 years. […] Seek emergency treatment right away if you have any of the following symptoms. They may mean you’re having a severe allergic reaction: Fast heart rate, Trouble breathing or swallowing, Tightness in your chest, Swelling in your mouth or face. […] Young children and older adults are at higher risk of complications from spider bites. It is more likely they will need to be seen by their family doctor after a possible bite. […] If you see the spider that bit you, take it with you to your doctor. It’s okay if it’s dead. Taking it will let your doctor identify the spider and know how to best treat your bite. […] Two spiders in the United States have venom that can cause severe skin and health issues. Venom is a fluid that spiders put into their victims when they bite them. This venom is what causes a reaction in your body. The two poisonous spiders that live in the U.S. are the black widow and the brown recluse.

• #2 Spiders | Better Health Channel

  https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/spiders

  Seek immediate medical help for bites from a funnel-web, mouse, redback or white-tailed spider. […] Antivenoms are available for the treatment of redback and funnel-web spider bites. […] People who are at greater risk of severe reactions to spider venom include babies, young children, the elderly and people with an existing heart condition. […] Some people may also be allergic to certain venom and experience an adverse reaction, including anaphylaxis (severe allergic reaction). Immediate medical treatment is recommended. […] Symptoms of a venomous spider bite depend on the species, but may include: redness and itching, increasing pain, nausea, vomiting, sweating (perspiring), dilated pupils, uncontrollable muscle spasms, unconsciousness. […] Additional symptoms for funnel-web or mouse spider bites include: lots of saliva and tears, muscle twitching, difficulty breathing, small hairs stand on end, numb mouth, fast pulse and high blood pressure, disorientation and confusion leading to unconsciousness.

• #2 Black Widow Spider Bite Treatment

  https://my.clevelandclinic.org/health/diseases/black-widow-spider-bite

  A female black widow spider bite can be dangerous. If you think a black widow bit you, seek medical care right away. […] Healthcare providers cant identify a particular spider based on its bite mark. There are no tests to confirm what kind of spider bit you. Providers usually diagnose a spider bite based on your symptoms. […] If you think a black widow spider bit you: Wash the area with soap and water. Apply an ice pack to help reduce pain and swelling and to delay the effects of the venom. […] Treatment for a black widow spider bite may include: Muscle relaxers and sedatives, to help relieve muscle pain and spasms. Analgesics, to help reduce pain. Antivenom, to help reverse the effects of the venom, including bodywide muscle cramping. […] The prognosis for black widow bites is generally good. With prompt treatment, you should make a full recovery within 24 to 48 hours. Some people experience long-term pain or muscle spasms after black widow bites, but this is rare. […] You should seek immediate medical attention if a black widow spider bites you.

• #2 What Does A Spider Bite Look Like? | Moxie Pest Control

  https://moxieservices.com/blog/what-does-a-spider-bite-look-like/

  Spider bites resemble common bug bites, appearing as red, swollen bumps that may be itchy or painful. Most spider bites are harmless and don’t lead to further symptoms. It’s important to note that many skin irritations can look similar but might be caused by other factors, such as bacterial infections. […] If you experience any of these symptoms, consult with your doctor right away. You are likely experiencing an allergic reaction to spider venom or have possibly encountered one of the more dangerous spider species. […] Some spider bites lead to infection, so it’s important to thoroughly clean and bandage any broken skin. You may end up needing antibiotics, steroids, or a combination of over-the-counter treatments. […] A brown recluse spider bite can be extremely dangerous. These spiders produce necrotic venom that can kill tissue and result in hospitalization if not treated. At first, a brown recluse bite will appear red and swollen but can change in appearance over the course of a day or two. Watch for blistering, open wounds, scabbing, and spread.

• #2 Spider Bites: Identify What Bit You and Get Proper Help

  https://www.healthline.com/health/spider-bites

  Prompt treatment is essential, especially in children and older adults. A doctor may prescribe an antivenom. […] Hobo spider bites are slow to heal. Seek immediate medical treatment if you suspect a hobo spider has bitten you. […] Treatment works best if administered within 24 hours of the bite. […] Seek medical attention immediately if you experience any of these symptoms. […] The bite of a Brazilian wandering spider is extremely painful. It can quickly result in heavy sweating and drooling. The skin around the bite will usually swell, turn red, and get hot. […] In severe cases, the bite can result in dead tissue or death. […] Always seek medical attention if you suspect you or someone else has symptoms of a spider bite. […] For the best outcome, seek treatment for a spider bite within 24 hours of being bitten.

• #2 Spider Bites

  https://healthlibrary.vidanthealth.com/Library/DiseasesConditions/Adult/NonTraumatic/85,P00860

  What are spider bites? All spiders in the U.S. have poison (venom). But the fangs of most spiders are too short or too fragile to break through human skin. Or their venom is too weak to cause damage to people or pets. Most spider bites cause only minor, local reactions at the bite site. But some spider bites can be deadly. […] How are dangerous spider bites diagnosed? A spider bite is diagnosed based on your history and your symptoms. A definite diagnosis of a spider bite needs all of these: You saw the spider bite your skin. The spider was captured and correctly identified by someone who is an expert on insects (entomologist). There is a skin sore lesion or you have overall (systemic) physical symptoms related to the spider bite. Any other conditions that could also cause the physical symptoms have been ruled out. […] Many of the symptoms of a brown recluse spider bite and a black widow spider bite may be caused by other health problems. Always see your healthcare provider for a diagnosis.

• #3 UC San Diego Health Health Library | San Diego Hospital, Healthcare

  https://myhealth.ucsd.edu/BreatheEasy/85,P00860

  Most spiders found in the U.S. are harmless, except for the brown recluse and the black widow spiders. […] A spider bite is diagnosed based on your history and your symptoms. A definite diagnosis of a spider bite needs all of these: […] Many of the symptoms of a brown recluse spider bite and a black widow spider bite may be caused by other health problems. Always see your healthcare provider for a diagnosis. […] Brown recluse spider bites are often diagnosed by mistake. They are often diagnosed in areas that dont have recluse spiders. […] Prompt treatment of both types of spider bites is key to preventing more serious complications, especially in children.

• #3 Spider Bites – Injuries; Poisoning – Merck Manual Professional Edition

  https://www.merckmanuals.com/professional/injuries-poisoning/bites-and-stings/spider-bites

  Diagnosis is typically suspected based on history and physical signs, but confirmation is rare because it requires witnessed biting, identification of the spider (the spider is rarely recovered intact), and exclusion of other causes. […] In nonendemic areas, a brown spider bite should not be diagnosed without identifying the spider. Many patients incorrectly attribute much more common methicillin-resistant Staphylococcus aureus (MRSA) skin infections to brown recluse spider bites. Such infections should be excluded, as should other conditions that mimic spider bites. […] Spiders are identified by location and markings. Widow spiders live outdoors in protected spaces (eg, rock piles, firewood cords, hay bales, outhouses) and have a red or orange hourglass marking on the ventral abdomen. Brown spiders live indoors or in protected spaces (eg, in barns, attics, and wood piles; behind furniture; under baseboards) and have a fiddle- or violin-like marking on the dorsal cephalothorax, extending from the eyes to the abdomen. This marking may be difficult to recognize even in the intact spider.

• #3 Black Widow Spider Bite Treatment

  https://my.clevelandclinic.org/health/diseases/black-widow-spider-bite

  A female black widow spider bite can be dangerous. If you think a black widow bit you, seek medical care right away. […] Healthcare providers cant identify a particular spider based on its bite mark. There are no tests to confirm what kind of spider bit you. Providers usually diagnose a spider bite based on your symptoms. […] If you think a black widow spider bit you: Wash the area with soap and water. Apply an ice pack to help reduce pain and swelling and to delay the effects of the venom. […] Treatment for a black widow spider bite may include: Muscle relaxers and sedatives, to help relieve muscle pain and spasms. Analgesics, to help reduce pain. Antivenom, to help reverse the effects of the venom, including bodywide muscle cramping. […] The prognosis for black widow bites is generally good. With prompt treatment, you should make a full recovery within 24 to 48 hours. Some people experience long-term pain or muscle spasms after black widow bites, but this is rare. […] You should seek immediate medical attention if a black widow spider bites you.

• #3 Spider Bites: Identify What Bit You and Get Proper Help

  https://www.healthline.com/health/spider-bites

  Always seek medical attention if you suspect one of the following species has bitten you: brown recluse, black widow, hobo spider, tarantula, Brazilian wandering spider. […] The initial brown recluse bite may be painless, but within 28 hours, it’ll begin to itch, hurt, and turn red. A red or purple ring resembling a target or bulls-eye will develop around the bite. […] The bite can blister and grow progressively worse without treatment to the point where it may kill surrounding tissue and cause fever, chills, and headache. […] There’s no antidote for a brown recluse bite, but keeping the area clean can encourage faster healing. Your doctor will examine the bite and prescribe antibiotics. People who experience tissue death may need surgery and time in the hospital. […] Black widow bites can feel like a small pinprick or nothing at all, but your skin’s reaction will be immediate. You’ll be able to see the two puncture marks on your skin.

• #3 What to Do About Spider Bites (for Parents) | Nemours KidsHealth

  https://kidshealth.org/en/parents/spider-bites-sheet.html

  Most spider bites don’t go all the way through skin, so they usually cause only mild reactions. But a bite from a black widow spider or brown recluse spider can cause serious reactions and needs medical care right away. […] If someone in your family might have a bite from a brown recluse spider or black widow spider, call the National Poison Control Center at 1-800-222-1222. Because spider bites contain venom, which is a type of poison, poison control is an expert resource. It’s available for free, 24 hours a day. […] Get Medical Care Right Away for a Spider Bite if: Your child has any signs of an allergic reaction. Your child develops any kind of rash after a bite. Your child has severe pain or cramping. The area begins to look infected (increasing redness, pain, swelling, warmth, or pus). You think your child was bitten by a brown recluse spider or black widow spider. Even without symptoms, have your child seen right away. Early treatment can help ease symptoms.

• #3 Common Spider Bites | AAFP

  https://www.aafp.org/pubs/afp/issues/2007/0315/p869.html

  Local wound care of Latrodectus bites should include thorough wound cleansing and ice pack application. Other treatments include oral or parenteral analgesics, benzodiazepines for muscular spasm and rigidity, and tetanus prophylaxis. […] In severe cases, the initial laboratory evaluation should include complete blood count and urinalysis to rule out peritonitis and urinary tract infections, and measurement of serum creatine phosphokinase and lactic dehydrogenase to detect rhabdomyolysis from muscular spasm and rigidity. […] Most Loxosceles bites in humans occur in the early morning; bites cluster wherever bed linens, bedclothes, or other garments squeeze the female spider between fabric and the victim’s skin, particularly under the arms, at the waist, or on the lower extremities under socks, stockings, or pants. Immediate wound care should include thorough cleansing, cold compresses, elevation of the bitten extremity, immobilization, oral or parenteral analgesics and antihistamines, and tetanus prophylaxis. […] Hyperbaric oxygenation has been recommended to reverse the expanding dermonecrosis of loxoscelism, but it has shown mixed treatment outcomes and is not supported by controlled trials.

• #4 Spider Bites

  https://healthlibrary.uwmedicine.org/Library/TestsProcedures/85,P00860

  Most spiders found in the U.S. are harmless, except for the brown recluse and the black widow spiders. […] A spider bite is diagnosed based on your history and your symptoms. A definite diagnosis of a spider bite needs all of these: […] Always see your healthcare provider for a diagnosis. […] In most cases, a spider bite is not the cause of the symptoms. […] Brown recluse spider bites are often diagnosed by mistake. […] Quick treatment of both types of spider bites is key to preventing more serious complications, especially in children.

• #4 How to Identify and Treat Spider Bites

  https://www.everydayhealth.com/bug-bites/spider-bites/

  Spider bites are uncommon, and doctors often misdiagnose them. […] There are characteristic signs and symptoms when it comes to venomous spider bites. Brown recluse bites sting, and they can resemble anything from small blisters to large, rotting-flesh sores, Vetter says. Its bite causes the collapse of the capillary bed also known as skin necrosis so people who are obese and have poor support of the capillary cells may have a more massive reaction, he explains. Along with a wide variety of skin symptoms, brown recluse bites can cause symptoms common to infections. The brown recluse’s bite is poisonous and can result in coma, kidney failure, or even death. […] Black widow bites can, in some cases, cause skin lesions, ranging from small red marks to angry, red, streaky skin patches that are inflamed or contain pus. But most of the reaction will be on the inside, Vetter says.

• #4 What Should I do if I Get a Spider Bite? – familydoctor.org

  https://familydoctor.org/spider-bites/

  You may not feel it if you’re bit by a brown recluse spider. But after a few hours, you’ll begin to feel pain. You may notice a bullseye on your skin where the spider bit you. It may look like a white blister with a red ring around it. As time goes on, the skin in the bullseye may turn purple or blue. You may notice the skin around the bite begins to die. This can lead to an open sore, also called an ulcer. This sore can continue to get bigger for 10 days after the bite. You may have chills, a fever, and body aches. […] Prevention is the key to avoiding spider bites. Remember, most spiders only bite when they feel threatened. Be aware of where spiders may live and be careful when in those areas. […] If you see a spider crawling on your skin, gently flick if off with your finger. If you’re in the house, watch where it lands, then remove it.

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