Skin-nontumor / Clinical Dermatology
Brown recluse spider
Reviewer: Mowafak Hamodat, MB.CH.B, MSc., FRCPC, Eastern Health, St. Johns, Canada (see Reviewers page)
Revised: 11 July 2011, last major update July 2011
Copyright: (c) 2002-2011, PathologyOutlines.com, Inc.
● Bite causes extensive necrosis, hemorrhage, blistering and ulceration (Wikipedia)
● A chronic pyodermal gangrenosum-like reaction has also been reported
● Also called loxoscelism (genus of spider is Loxosceles), necrotizing arachnidism
● Diagnosis can be made by swabbing the lesion and using a specific enzyme-linked immunosorbant assay (ELISA) to detect the venom
Location of brown recluse spider in US
● Controversial (Ohio State University Fact Sheet)
Brown recluse spider and US quarter
Brown recluse spider bites
● Varies from neutrophilic vasculitis with hemorrhage to arterial wall necrosis to eschar covered ulceration and subcutaneous necrosis
● Usually eosinophils in the inflammatory infiltrate
End of Skin-nontumor / Clinical Dermatology > Infestations > Brown recluse spider
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