An Unusual Presentation of Subungual Pigmentation: Cotton Sock Debris Mimicking Subungual Hemorrhage With Concern for Subungual Melanoma

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Differentiation of benign and malignant pigmented nail lesions often requires clinical, dermatoscopic, and histological correlations. The authors report a singular and instructive case of cotton sock debris mimicking subungual hemorrhage (SH) with concern for subungual melanoma (SUM) to supplement the clinician's arsenal of differential diagnoses of pigmented nail lesions.

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