Diagnosis involves medical imaging. Differential diagnosis includes mainly bizarre parosteal osteochondromatous proliferation (BPOP), which is more irregular and tends to involve the middle of the finger or toe rather than the end near the nail. They are distinct from<unk>  osteochondroma.
Subungual exostosis
Buccal exostosis
Pachydermoperiostosis
Thanatophoric dysplasia
Osteoma cutis
Congenital dermal sinus
Omphalolith
Metachondromatosis