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What is Henoch-Schonlein purpura (HSP)?
Henoch-Schonlein purpura (HSP)
is a form of blood vessel inflammation or vasculitis. There are many different conditions that feature vasculitis. Each of the forms of vasculitis tends to involve certain characteristic blood vessels. HSP affects the small vessels called capillaries
in the skin and frequently the kidneys. HSP results in a purplish skin rash
(most prominent over the buttocks and behind the lower extremities)
associated with joint inflammation (arthritis) and sometimes cramping pain
in the abdomen. Henoch-Schonlein purpura is also referred to as anaphylactoid purpura.