What type of nail condition is characterized by a 90-degree fold starting at the matrix?

The condition characterized by a 90-degree fold starting at the matrix is known as a plicatured nail. This abnormality often manifests as the nail plate bending downwards or folding onto itself, creating a sharp angle and giving the nail a distinct appearance. Plicatured nails can often lead to discomfort and may affect the way the nail grows, resulting in a variety of complications if not monitored.

Understanding the etiology of plicatured nails is also important, as they can arise due to trauma, improper nail care, or as part of certain systemic conditions. This insight into the condition allows nail technicians and cosmetologists to provide better care and recommendations for clients experiencing this nail issue.

While other conditions listed, such as onycholysis, pincer nails, and onychomycosis, have their own specific characteristics and symptoms, they do not present with the 90-degree fold that is indicative of plicatured nails. These distinctions are vital for accurate diagnosis and treatment in professional nail care.