Erythema multiforme (EM) is an immune-mediated eruption characterized by acral targetoid lesions that is due mostly to an infection particularly herpes and Mycoplasma infections. A 26-year-old woman presented with a necrotic erythematous lesion under her right breast and an erythematous and targetoid lesions on the distal parts of her extremities following a spider bite. She had not used any medication and she gave no prior history of herpetic infection. We imputed the spider bite as the cause of EM based upon the clinical history and the laboratory tests that failed to implicate another cause of EM. As far as we know, this is the second reported case of EM induced by a spider bite. We suggest that Loxosceles spider bites may cause erythema multiforme.
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