Pincer nail, which is characterized by transverse overcurvature of the nail plate and progressive pinching distally, is a rare dystrophy of unknown pathogenesis. Several causative factors have been identified, including heredity, psoriasis, ill-fitting shoes, subungual exostoses, drug induction, trauma, and other idiopathic agents.This condition existed in many patients for extended periods before medical intervention, but the early pathology of this deformity remains unclear. We describe a rare case involving a mild incurved nail that progressed rapidly to severe pincer nail.
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