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Henoch-Schőnlein purpura (HSP) has a long history. The clinical features were described by Heberden in 1802 and further descriptions were provided by Schőnlein in 1847 and by Henoch in 1874. Despite this history the diagnostic criteria are still debated. Until the last decade or so the typical rash has been thought to be diagnostic. More recently, however, IgA deposition in the tissues has been proposed as an …
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