Beau's lines (corrugations)

Sign: Often indicated by furrows or wavy horizontal lines across the nails. The furrows may split open causing pain, and an infection could occur if dirt enters the split.

Cause: May result from infectious diseases, pregnancy, heart disease, emotional shock, injury, a major surgery or alcoholism.

Treatment: Mild cases may be treated carefully by gently buffing to help smooth out furrows. Refer more severe cases to a dermatologist. New growth gets rid of the problem.