Pigmented Purpuric Dermatosis in a Kickboxer: The Role of Repetitive Microtrauma.

A 41-year-old male kickboxer presented with bilateral, macular, red skin discoloration around the ankles, fading proximally and exhibiting a sharp linear demarcation above the lateral malleoli. The discoloration was more pronounced medially and on the right side. Histology revealed spongiosis, intraepidermal and papillary dermal erythrocytes, and perivascular lymphocytic inflammation, confirming the diagnosis of pigmented purpuric dermatosis (PPD). Repetitive microtrauma from kickboxing likely contributed to capillary fragility, compounded by exercise-induced inflammation and increased venous pressure, which may have promoted endothelial dysfunction and capillary rupture. PPD, or capillaritis, refers to a group of benign, chronic dermatologic conditions characterized by purpuric eruptions such as macules, patches, and petechiae, often idiopathic in nature. This case highlights the potential role of physical activity in triggering PPD. It emphasizes the importance of recognizing exercise-related patterns to refine diagnosis and management strategies for patients involved in high-impact sports.