Levamisole-induced occlusive necrotizing vasculitis of the ears after use of cocaine contaminated with levamisole.
Buchanan JA, Vogel JA, Eberhardt AM. Levamisole-induced occlusive necrotizing vasculitis of the ears after use of cocaine contaminated with levamisole. J Med Toxicol. 2011 Mar; 7(1):83-4.