Answer 4 Henoch-Schönlein purpura. Henoch-Schönlein purpura is one of the small-vessel vasculitides characterized by palpable purpura, with a distribution of lesions primarily over the lower extremities and buttocks. Some patients have nephritis or bowel involvement. Severe gastrointestinal or renal involvement is treated with glucocorticoids. Polyarteritis nodosa generally has painful ulcerating lesions on the lower extremities and is associated with HBV infection. Mixed cryoglobulinemia is generally associated with HCV infection. Systemic lupus erythematosus is not precipitated by an acute upper respiratory infection. The lack of bloody bowel movements makes inflammatory bowel disease less likely. Click here to return to the questions

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