Henoch-Schönlein purpura (HSP) is a disease involving inflammation of small blood vessels. It most commonly occurs in children. The inflammation causes blood vessels in the skin, intestines, kidneys, and joints to start leaking. The main symptom is a rash with numerous small bruises, which have a raised appearance, over the legs or buttocks. There is no specific treatment for HSP, you can use over-the-counter pain medicines, such as acetaminophen or nonsteroidal anti-inflammatory drugs (NSAIDs), such as ibuprofenand naproxen for joint pain. In some cases, corticosteroid medication may be used. The rash and joint pain will usually go away after four to six weeks without causing any permanent damage.