Nail curvature is significantly increased in which condition?

Nail curvature is significantly increased in the condition known as pincer nails. This condition is characterized by an abnormal narrowing of the nail plate, which leads to an increased curvature as it grows. Pincer nails often have a claw-like appearance and can cause discomfort or pain, particularly if they dig into the surrounding skin. The increased curvature occurs because the sides of the nail plate grow inwards, which tightens the nail around the fingertip.

In contrast, plicatured nails involve a fold in the nail plate but do not result in the same degree of curvature as seen in pincer nails. Onycholysis refers to a condition where the nail separates from the nail bed, resulting in lifting but not necessarily an increase in curvature. Malanonychia is characterized by the presence of brown or black pigmentation in the nail but does not affect the curvature of the nail itself. Thus, the correct identification of increased nail curvature in pincer nails reflects a comprehensive understanding of the conditions affecting nail morphology.