Overview
Henoch-Schonlein purpura (HSP) makes the small blood vessels in your child's body swell. It can cause a red or purple rash on the legs and buttocks, joint pain, or belly pain. It may also be called IgA vasculitis.
Often, the cause of HSP is not known. Sometimes it can be caused by another illness, such as a cold or virus. Certain foods, or even an insect bite, can also trigger HSP.
Most of the time, the rash and joint pain go away within a few weeks. Belly pain will likely go away sooner, within 3 days in most cases.
Follow-up care is a key part of your child's treatment and safety. Be sure to make and go to all appointments, and call your doctor if your child is having problems. It's also a good idea to know your child's test results and keep a list of the medicines your child takes.