Hx: 68 y M cocaine user, recent haemorrhagic lesions on forearms/face, anamnestic analogous vasculitis 6 months priorLab: pancytopenia/neutropenia; ANA+; p-ANCA+; anti-PR3+; anti-MPO+Skin biopsy: leukocytoclastic vasculitis with subepidermal bullaeDx: levamisole-induced vasculitisTx: 6 months cocaine abstinence. The gene discussed is MPO; the disease is neutropenia.