A case of granulomatous pigmented purpuric dermatosis

Background: Pigmented purpuric dermatosis (PPD), or capillaritis, is an inflammatory skin disorder of unclear etiology most classically presenting as petechiae and red-brown macules on the lower extremities. PPD is characterized histologically by perivascular lymphocytes with extravasation of erythrocytes and hemosiderin deposition. PPD includes multiple subtypes including Schamberg's disease, Purpura annularis telangiectoides of Majocchi, pigmented purpuric lichenoid dermatitis of Gougerot and Blum, eczematid-like purpura of Doucas and Kapetanakis and Lichen aureus, as well as the newly described granulomatous PPD.

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