Subungual exostosis is a benign osteochondral tumor usually involving the distal phalanx of the great toe. It rarely occurs on other toes or the fingers. We report a case of a 26-year-old male who presented with a growing painful nodule on his right 4th finger. Diagnosis was confirmed by radiologic and histopathologic studies, followed by complete excision of the lesion. At the 13-month follow-up, there was no sign of recurrence. We think that subungual exostosis should be considered in the differential diagnosis of any digital mass.
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