Henoch schonlein purpuraIt is a common vasculitis in children This is a vasculitis with IgA deposits affecting small vesseles like arterioles, capillaries and venules of the skin, gut and glomeruli and commonly associated with arthralgia. Clinical features include palpable purpura (due to vasculitis and not reduced platelet count), colicky abdominal pain, arthalgia in multiple Joints and glomerulonephritis. It is caused due to immune complex deposition but complement levels are usually normal.