The hobo spider, Tegenaria agrestis, is a funnel-web spider that sometimes lives in people's houses; its bite is mildly poisonous and leads to a condition sometimes called tegenarianism. Though some hobo-spider bites are dry, meaning no venom has been injected, others require attention. Venomous bites lead to the development of common signs and symptoms and may require identification and treatment by qualified medical personnel.
Localized Signs
Common signs include the presence of bite marks (multiple marks could occur if the spider was trapped against the skin by clothing), redness around the bite site and possibly pain, though some hobo-spider bites are painless. Within a few hours, a small red hardened area may develop. The area may mimic the look of a mosquito bite. This can progress and lead to the appearance of a bullseye surrounding the bite area. Blistering can occur withing 24 to 48 hours. Painful ulcers can result from the rupturing of blisters. Scabbing may occur.
Systemic Signs
Severe headaches are common for those bitten by the hobo spider. Headaches often don't respond to over-the-counter options. Weakness, dry mouth and lethargy can set in. Other systemic signs of a hobo-spider bite include dizziness, visual impairment and hallucinations. Vomiting and diarrhea are also possible as your body attempts to eliminate the poisonous venom. The venom may lead to joint pain and, in severe cases, bone marrow failure.
Considerations
If you believe a hobo spider bit you, capture the spider if possible and take it with you for identification purposes. The sex of the spider often determines the severity of reactions to its bite. According to Darwin K. Vest, an authority on the hobo spider, lab experiments indicate that the male's bite produces more severe effects. Any bite should be reported to a physician immediately for proper care and identification. This can help improve the chances of a favorable outcome.
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