What do horizontal wavy ridges across the nail indicate?

Horizontal wavy ridges across the nail, known as corrugations, indicate an alteration in the nail's growth. These ridges can occur due to several underlying factors, including trauma to the nail matrix, stress, or health issues affecting overall nail development. When the matrix—the tissue that produces the nail—experiences disruption, it can lead to this characteristic wavy appearance.

Understanding this can help professionals in the cosmetology field assess the nail's health and determine if there is a need for further investigation or referral to a healthcare provider. Identifying these ridges is essential for maintaining nail wellness and providing appropriate care to clients.