<unk>  presents with thickened nails without deformity, and this simple thickening may be the result of trauma, acromegaly, Darier's disease, psoriasis, or pityriasis rubra pilaris, or, in some cases, hereditary.
Onychauxis
Onychoschizia
Koilonychia
Onychophosis
Sparganosis
Pyromania
Riehl melanosis
Median nail dystrophy