Henoch-Schonlein purpura (HSP) is a fairly common autoimmune childhood disorder that may affect adults as well, although less frequently. Children with this condition are often initially seen with acute abdominal pain and are referred for surgical evaluation. HSP is characterized by purpura, or allergy=related bleeding into the skin and other tissues. The characteristic palpable purpuric rash is found in the majority of cases and is considered the hallmark of the disease. This rash is most often located on the buttocks and upper thighs in children and on the feet and ankles in adults. Symptoms also occurring with HSP are joint pain, gastrointestinal disorders and kidney involvement. Less common manifestations include peripheral neuropathy and testicular torsion.