Acquired Periungual Fibrokeratoma Looks like a Supernumerary Digit: An Uncommon Soft Tissue Tumor.

Acquired digital fibrokeratoma is an uncommon, benign fibrous tumor that usually occurs in adults as a solitary lesion with a typical size of less than 1 cm. We present a case with periungual growth and nail plate deformity. The growth was completely excised after raising the epinychial flap and the fold was reconstructed. The histological results confirmed the digital fibrokeratoma. The rarity of digital fibrokeratoma and its unique morphological appearance of the tumor makes it interesting. Acquired periungual fibrokeratoma, an uncommon benign fibrous tumor of an unknown etiology, typically found at the distal end of the digits, may present with nail plate deformation due to chronic pressure, and in order not to damage the matrix, the tumor should be excised carefully, which can cause permanent nail dystrophy. In addition, we emphasize the importance of ruling out other causes of abnormal growths and of considering fibrokeratoma during differential diagnoses.