Henoch-Schönlein purpura (HSP) is a disease that inflames small blood vessels. The inflammation causes blood vessels in the skin, intestines, kidneys, and joints to start leaking. The main ...

HSP’s characteristic rash presents as small red dots on the skin, usually on the legs and buttocks, which changes from red to purple, and later to brown, before fading over the following 10 days.

HSP causes inflammation in small blood vessels. As the blood vessels become inflamed, they can leak blood into the skin, which causes the rash. Blood can also leak in the abdomen and kidneys.

HSP generally should not be a cause for concern ... It causes bleeding inside the body and underneath the skin, which presents as non-blanching rashes. These rashes might look similar to small ...