Nail plate is intact. Nail overcurvature and subungual clavus may be present. Type II or moderate deformity: exostosis is distal to the nail plate.
[…] diagnosis may include nail deformities, such as traumatic onycholysis, onychogryphosis, verrucae, subungual infection, or nail trauma.6,7 Case Report A 7-year-old boy presented
Type III: exostosis is located under the nail bed. Upward pressure by the tumor causes a pincer nail deformity, variable destruction of the nail bed and onycholysis.