Cydnidae Pigmentation on Palms Resembling Black-Ink Stains

TL;DR

A man developed black-ink-like stains on his palms during monsoons, which were diagnosed as cydnidae pigmentation and resolved on their own.

Contribution

This case highlights cydnidae pigmentation as a rare, self-limiting condition that can mimic ink stains.

Findings

The patient's stains resolved spontaneously within 10 days without treatment.

Clinical and dermoscopic features confirmed the diagnosis of cydnidae pigmentation.

No history of trauma, chemicals, or drugs was associated with the condition.

Abstract

We report a case of a 26-year-old male, a student by profession, who noticed black-ink-like stains over palms not removed with soap and water on relocating to a new flat during monsoons. The patient had no history of trauma, contact with chemicals, or drug intake. Sudden onset during monsoons, absence of symptoms, characteristic clinical and dermoscopic findings, and spontaneous resolution within 10 days led to a diagnosis of cydnidae pigmentation.

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