Diagram of Henoch-Schönlein Purpura (IgA vasculitis), a condition that causes a purplish skin rash, typically on the legs and buttocks, due to inflammation of small blood vessels.
Diagram of Henoch-Schönlein Purpura (IgA vasculitis), a condition that causes a purplish skin rash, typically on the legs and buttocks, due to inflammation of small blood vessels.