<unk>  is a cutaneous condition characterized by a distinctive tumor of the nail matrix. This nail disease can mimic many nail problems and should be examined and biopsied by a dermatologist. In particular, a main concern is the malignant and destructive potential that may exist.
Onychomatricoma
Trichofolliculoma
Nevus of Ota
Pilomatricoma
Papillary hidradenoma
Cutaneous columnar cyst
Eruptive vellus hair cyst
Dermal cylindroma