Subungual exostosis (SE) is a relatively uncommon benign tumor of the bone occurring in the distal phalanx of a digit. Its similarities to other dermatologic disorders involving the nail bed often can lead to misdiagnosis, which may result in inadequate or extreme treatments. We present a case of a 20-year-old man with an exquisitely tender lesion on the distal phalanx of the left fourth toe.
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