Overview

Henoch-Schonlein purpura (also known as IgA vasculitis) is a disorder that causes the small blood vessels in your skin, joints, intestines and kidneys to become inflamed and bleed.

The most striking feature of this form of vasculitis is a purplish rash, typically on the lower legs and buttocks. Henoch-Schonlein purpura can also cause abdominal pain and aching joints. Rarely, serious kidney damage can occur.

Henoch-Schonlein purpura can affect anyone, but it's most common in children under 10. The condition usually improves on its own. Medical care is generally needed if the disorder affects the kidneys.