HSP is relatively common.
It causes a blotchy red-purple raised rash (so-called purpura) on the feet, ankles, backs of legs and buttocks. Children commonly have painful feet and ankles, and may have abdominal pain.
It is very common to show small amounts of blood and protein in the urine, detected by a dip stick test.
Most children make a full and rapid recovery. A small percentage of children develop severe acute kidney injury, with poor urine output and high blood pressure, and may need to be supported with dialysis treatment and treated with drugs including prednisolone (a steroid medicine).