Traumatic nail split

J Cosmet Dermatol. 2004 Jul;3(3):171-2. doi: 10.1111/j.1473-2130.2004.00108.x.

Abstract

In nail split, the nail plate is divided into two parts. Trauma involving the nail matrix, the generator of the nail plate, can result in nail plate splitting which may take some months to become apparent. Photographic documentation of this condition in the literature had hitherto been lacking.