brown recluse spider

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brown recluse spider2016-11-08T22:15:07+00:00

brown recluse spider

brown recluse spider map image from New Medical Terms

map indicating brown recluse spider’s territory


The trivial name for a poisonous spider, Loxosceles reclusa, which lives in warmer parts of the US, and is identified by the presence of a characteristic violin-like marking on its dorsal surface. Its cousin, L laeta, is native to South America and more toxic than L reclusa.

brown recluse spider size image from New Medical Terms

size of brown recluse spider

Clinical findings

Local symptoms Cyanosis, necrosis, pustule or bullae, rimmed by ischaemia and erythaema expanding to 20 cm over weeks to months, accompanied by lymphadenitis


brown recluse spider skin necrosis image from New Medical Terms

skin necrosis caused by brown recluse spider

Systemic symptoms Fever, chills, headache, nausea, vomiting, dizziness, purpura, myalgia, arthralgia, DIC, and potentially fatal intravascular haemolysis with haemoglobulinuria and acute renal failure

Mechanism of injury Loxoscles venom contains several necrolysing enzymes

Management Surgical excision of bite site ASAP, which limits the spread of toxins, split thickness skin grafting, corticosteroids, antihistamines; with advanced lesions, tetanus immunisation is required, bacterial culture, and broad-spectrum antibiotics


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