What are Beau's lines?

Beau's lines are specifically characterized as lines that run horizontally across the nail plate. These lines are typically considered a sign of temporary interruption in nail growth, often caused by stress factors such as illness, injury, or nutritional deficiencies. This interruption results in the formation of visible grooves or indentations across the nail surface, which can vary in depth and spacing depending on the nature of the interruption.

The other options describe different nail conditions. Red spots or discoloration on the nail bed are indicative of other issues, such as blood under the nail or fungal infections. Splits in the nail usually refer to physical damage and structural problems, while color changes in the nail can indicate a range of health issues but do not specifically refer to Beau's lines. Understanding Beau’s lines is important in cosmetology as they can provide insight into a client's overall health and nail care needs.