title: Necrotizing vasculitis (erythema elevatum diutinum).
mesh_terms: D004890:Erythema / Q000150:complications*; D005121:Extremities; D006801:Humans; D007871:Leg Ulcer / Q000209:etiology; D008297:Male; D008875:Middle Aged; D011693:Purpura / Q000209:etiology; D012883:Skin Ulcer / Q000209:etiology