Abstract
To the Editor.— Pincer nail is a dystrophy characterized by a transverse overcurvature that increases along the longitudinal axis of the nail and reaches its greatest proportion at the distal part. 1 At this point, a particular type of ingrown nail is seen; the lateral borders tighten around the soft tissues, which they pinch without necessarily breaking through the epidermis. After a while, the soft tissue may actually disappear and can even be accompanied by a resorption of the underlying bone as has been noted previously by Cornelius and Shelley. 2 These lateral borders of the nail act as levers and maintain a permanent constriction of the deformed nail plate. In extreme cases, they can join together, forming a tunnel or they may roll about themselves in the form of a cone. In certain varieties, the nails are shaped in the form of claws or resemble pachyonychia congenita. 1 This
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