title: Nailing down the cause of periungual lesions.
mesh_terms: D005260:Female; D005385:Fingers; D006801:Humans; D007238:Infarction / Q000209:etiology*; D012867:Skin / Q000098:blood supply*; D018366:Vasculitis, Leukocytoclastic, Cutaneous / Q000150:complications*