Abstract
Background: Pigmented purpuric dermatosis is a generic term for a variety of chronic conditions that they have in common multiple eruptive, pinpoint, non-blanching, red macules over the skin. Unilateral pigmented purpuric dermatosis is a rare condition.
Case Report: We present the case of a 38-year-old man with asymptomatic purpuric pigmentations that developed on the extensor side of the left lower extremity 6 months before presentation. Histopathological analysis revealed focally perivascular inflammatory infiltrates, consisting mainly of lymphocytes and conspicuous extravasation of red blood cells into the papillary dermis. No histological evidence of vasculitis was detected.
Conclusions: The case was compatible with diagnosis of pigmented purpuric dermatosis.

Keywords: Pigmented purpuric dermatosis, unilateral, Lower Extremity