Which term is associated with a nail becoming smaller over time?

The term that pertains to a nail becoming smaller over time is known as onychatrophia. This condition involves the wasting away or atrophy of the nail, leading to a reduction in size and, oftentimes, changes in the overall appearance of the nail itself. Onychatrophia can occur due to various reasons, including trauma, underlying health issues, or specific nail disorders.

In contrast, other terms relate to different conditions. Onychocryptosis, commonly known as an ingrown nail, involves the nail growing into the surrounding skin, causing pain and inflammation rather than a reduction in size. Pterygium refers to an abnormal growth of skin or tissue around the nail, while onychauxis describes an abnormal thickening of the nail, which is the opposite of the size reduction associated with onychatrophia. Understanding these terms is crucial for properly identifying and addressing nail conditions in a manicure and pedicure context.