• Catherine Chung, Paul C Tumeh, Ron Birnbaum, Belinda H Tan, Linda Sharp, Erin McCoy, Mary Gail Mercurio, and Noah Craft.
• University of Rochester School of Medicine and Dentistry, Rochester, New York, USA.
• J. Am. Acad. Dermatol. 2011 Oct 1;65(4):722-5.

BackgroundDermatologists at the University of California, San Francisco recently reported two patients in the online Journal of the American Academy of Dermatology with purpura presumably induced by levamisole in contaminated cocaine. Levamisole-induced vasculitis and neutropenia has been reported elsewhere in the United States and Canada. Up to 70% of cocaine in the United States could be contaminated.ObjectiveWe sought to describe similar cases of vasculitis associated with cocaine use.MethodsThis is a retrospective case series.ResultsWe report 6 remarkably similar patients seen over just the past few months with retiform purpura on the body and tender purpuric eruptions, necrosis, and eschars of the ears after cocaine use in New York and California. All of these patients had positive perinuclear antineutrophil cytoplasmic antibody values and 3 of the 6 also had an associated neutropenia. Direct immunofluorescence studies suggested an immune complex-mediated vasculitis.LimitationsThis case series is descriptive in nature and, because testing is not easily performed, we did not test for levamisole in the serum or blood to prove this is the causative agent.ConclusionIt appears the use of cocaine is associated with the peculiar clinical findings of ear purpura, retiform purpura of the trunk, and neutropenia. We believe this case series may represent the tip of the iceberg as a looming public health problem caused by levamisole. Although the direct causal relationship may be difficult to establish, the astute dermatologist or primary care physician should be able to recognize the characteristic skin lesions and should be wary of the potential development of agranulocytosis.Copyright © 2010 American Academy of Dermatology, Inc. Published by Mosby, Inc. All rights reserved.

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