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IgA mediated small vessel vasculitis. 
Some overlap with IgA nephropathy (Berger's disease). 
HSP is usually seen in children following an infection.

''Features''
    palpable purpuric rash (with localized oedema) over buttocks and extensor surfaces of arms and legs
    abdominal pain
    polyarthritis
    features of IgA nephropathy may occur e.g. haematuria, renal failure

''Treatment''
    analgesia for arthralgia
    treatment of nephropathy is generally supportive. There is inconsistent evidence for the use of steroids and immunosuppressants

''Prognosis''
    usually excellent, HSP is a self-limiting condition, especially in children without renal involvement
    around 1/3rd of patients have a relapse