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

## TL;DR

A kickboxer developed a skin condition called pigmented purpuric dermatosis, likely due to repeated minor injuries from training.

## Contribution

This case highlights how repetitive microtrauma from high-impact sports can trigger pigmented purpuric dermatosis.

## Key findings

- The patient's skin condition was confirmed as pigmented purpuric dermatosis through histological analysis.
- Repetitive microtrauma from kickboxing is suggested as a contributing factor to capillary fragility and inflammation.
- The case emphasizes the importance of considering physical activity patterns in diagnosing and managing similar dermatologic conditions.

## Abstract

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.