Trachyonychia: case report and review of the literature.

Trachyonychia is the term used to describe nail plate roughness, pitting, and ridging that may affect 1 to 20 nails. Alopecia areata, psoriasis, lichen planus, atopic dermatitis, ichthyosis vulgaris, as well as other skin conditions have been associated with trachyonychia, but the causal relationship is often challenging to demonstrate histologically. Clinical evidence of these cutaneous disorders in conjunction with a nail matrix biopsy may help elucidate an etiology of trachyonychia, but many cases often remain idiopathic. Nail biopsy findings may match skin histology, but more commonly show spongiotic or nonspecific changes. We present an interesting case of a female with progressive development of trachyonychia in all 20 nails coinciding with a new diagnosis of sarcoidosis.