Subungual Basal Cell Carcinoma: A Rare Nail Tumor with a Challenging Diagnosis.

Subungual basal cell carcinoma (BCC) is a rare disorder associated with many factors, including contact with some topical and oral substances. A differential diagnosis and an early approach are important to minimize the functional damage of the limbs affected by this type of tumor. We report a case of subungual BCC in a 70-year-old woman that was managed by surgical excision.