Henoch–Schönlein purpura

Inflammation of small blood vessels, causing leakage of blood into the skin, joints, kidneys, and intestine. The disease is most common in young children, and may occur after an infection such as a sore throat. The condition may also be due to an abnormal allergic reaction. The main symptom is a raised purplish rash on the buttocks and backs of the limbs. The joints are swollen and often painful, and colicky abdominal pain may occur. In some cases, there is intestinal bleeding, leading to blood in the faeces. The kidneys may become inflamed, resulting in blood and protein in the urine. The only treatment usually required is bed rest and analgesic drugs. Complications may arise if kidney inflammation persists. In severe cases, corticosteroid drugs may be given.