High Quality Content by WIKIPEDIA articles Henoch-Sch nlein purpura (HSP, also known as anaphylactoid purpura, purpura rheumatica, and Sch nlein-Henoch purpura) is a disease of the skin and other organs that most commonly affects children. In the skin, the disease causes palpable purpura (small hemorrhages); often with joint and abdominal pain. With kidney involvement, there may be a loss of small amounts of blood and protein in the urine, but this...