Assertion: schönlein purpura | /r/HasSubevent | purpuric rash
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Source sentences:
text: Henoch-Schönlein purpura is an IgA-mediated, autoimmune, hypersensitivity vasculitis of childhood that results in a triad of symptoms, including a purpuric rash occurring on the lower extremities, abdominal pain or renal involvement, and arthritis.