Post-traumatic acquired polyonychia: a rare occurrence.

The majority of nail disorders are usually acquired; few are of congenital origin. Trauma to the nail unit commonly leads to dystrophy or deformity of the nail, but a division of the nail matrix can result in acquired polyonychia (split nail). Herein we describe a case of a 50-year-old male who had trauma in childhood after which he developed two nails on the right thumb. Cutaneous examination and X-ray revealed a well-defined split nail plate on the thumb. Surgery was advised but patient declined any surgical intervention. We describe this case for its rare occurrence.