Wolf spider envenomation
Lycosa venom is primarily cytotoxic. Venom of some species may contain histamine.
Envenomation by Lycosa species is typically benign, though there is a common belief that wolf spider bites can cause tissue necrosis like the recluse spiders. This idea is not supported by data from several studies. A bite from a wolf spider is typically painful and lasts only 10 minutes. Puncture marks with localized bleeding, swelling, and erythema might be evident, and there may be some itching at the bite site. Systemic symptoms are rarely reported and include nausea, headache, and malaise.
T63.391A – Toxic effect of venom of other spider, accidental, initial encounter
217665000 – Poisoning due to venomous spider
Differential Diagnosis & Pitfalls
- CA-MRSA skin infection (presenting as an abscess or abscesses or furunculosis) is often mistaken for spider bites. Have a very high suspicion for CA-MRSA and discount the patient history of a spider bite if there is any clinical suspicion of CA-MRSA.
- Caterpillar envenomation
- Centipede envenomation
- Contact dermatitis / contact dermatitis (pediatric)
- Factitial ulcer
- Hymenoptera stings (bee sting, wasp sting)
- Insect bites