Twenty nail dystrophy

Twenty nail dystrophy, also known as Trachonychia is a condition characterised by the rough linear ridges developed on but not specifically all twenty nails of the fingers and toes. The nails are opalescent and frequently are brittle and split at the free margin. There has been evidence of the condition as a cutaneous manifestation of lichen planus. It has also been associated with other diseases such as eczema, psoriasis, alopecia areata. It is more common in children and becomes less obvious with age.