A 16 y/o male presents with 9 days palpable, purpuric, non-pruritic rash that began on legs and spread quickly upwards; also c/o polyarticular arthritis, abdominal pain. Mild improvement after short course of steroids, finished 2 days ago. Joint/abdominal pain now worse. PMH, noncontributory; no sick contacts. What else do you need to know?
Answer: A. Henoch-Schönlein purpura
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