Painful, swollen big toe.
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Bony overgrowth projects from the dorsal cortical surface of the 1st distal phalanx causing enlargement of the nail bed and upward displacement of the nail plate.
Subungual exostosis is a benign osteocartilaginous acquired solitary bone tumor of the distal phalanx that occurs beneath or adjacent to the nail.
It affects both sexes equally, most frequently in the second and third decades of life.
The etiology of subungual exostosis is unknown and may be genetic. It has been associated with a history of traumatic injury or repeated/chronic infection.