Onychogryphosis is a hypertrophy that may produce nails resembling claws or a ram's horn.

Onychogryphosis may be caused by trauma or peripheral vascular disease, but most often secondary to self-neglect and failure to cut the nails for extended periods of time.

[4] Some recommend avulsion of the nail plate with surgical destruction of the nail matrix with phenol or the carbon dioxide laser, if the blood supply is adequate.

[2]: 783–4 [5]: 659 Severe congenital onychogryphosis affecting all twenty nailbeds has been recorded in two families who exhibit the dominant allele for a certain gene.

Rather, it is brought to the attention of manicurists who routinely file the clawed toenail flat.