subungual exostosis

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sub·un·gual ex·os·to·sis

painful osseous outgrowths that elevate the nail of the great toe or fingers in young people.
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Subungual exostosis occurs more often in toes than fingers, more often in girls than boys, and more often in children and young adults than older individuals, Dr.
Subungual exostosis of the toe--essentially an ossified cartilaginous cyst--is fairly common and is seen most often by podiatrists.