<prompt> A child develops non-blanching macules and papules on lower extremities, mild abdominal pain and skin biopsy showed IgA deposition. Most appropriate diagnosis is:Drug induced vasculitisHenoch Schonlein purpuraWegeners granulomatosisKawasaki disease  <response>: b. Henoch Schonlein purpuraRef: Nelsons 20e p 1612, Ghai 8e p 632Classification criteria for H.S. purpura according to Pediatric Rheumatology European Society:Palpable purpura in absence of coagulopathy or thrombocytopenia and 1 or more of the following criteria:Diffuse abdominal painArthritis or arthralgiaBiopsy of affected tissue demonstrating predominant IgA depositionRenal involvement proteinuria, hematuria or red cell castsHence, it is a typical case presentation of Henoch-Schonlein purpura. 