What term describes a condition where a client's nail corners are folded at a 90° angle?

The condition where a client's nail corners are folded at a 90° angle is referred to as a plicated nail. This term specifically denotes the abnormal folding of the nail, which can occur due to a variety of factors such as trauma or excessive pressure on the nail matrix. Plicated nails may cause discomfort and can often be mistaken for other nail conditions if not properly identified.

In contrast, curved nails typically grow in a rounded manner and do not feature the distinctive fold at the corners. Ingrown nails involve the edges of the nail growing into the surrounding skin, leading to pain and potential infections, but do not describe a corner-folding condition. Cone nails are characterized by an unusual tapering of the nail, which does not align with the 90° angle folding described in the question. Understanding these definitions is crucial for distinguishing various nail conditions in practice.