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Henoch-Schönlein purpura

Henoch-Schönlein purpura (HSP) is also known as anaphylactoid purpura and is characterized by "palpable purpura" which are 1 to 5 mm papules with petechial centers or completely purpuric papules. HSP is considered an IgA-mediated inflammation of small vessels. The mnemonic PAPAH can be used to remember the clinical features of HSP: Purpura, Abdominal Pain, Arthralgias and Hematuria.

More Info: Henoch-Schönlein Purpura (HSP)