A contour line under the eyes may be caused by genetics, lack of sleep leading to lower eyelid skin folds, fine lines and bags under the eyes, and is generally normal. There are many reasons for a contour line under the eyes, including heredity leading to symmetrical line-like folds under the eyes, lack of sleep due to over-exertion of the eyes, tension in the muscles under the eyes due to frequent smiling, and skin wrinkles due to increasing age. Daily attention to regular life, ensure adequate sleep, avoid staying up late, drink more water, and maintain the elasticity of the skin around the eyes. Pay attention to eye hygiene, it is recommended to properly relax the eyes, you can look into the distance, do massage around the eyes. Deep eye lines affect the beauty of the use of hydration, anti-wrinkle eye cream appropriate relief. There is a contour line under the eyes, usually affects the appearance, but is a normal phenomenon, according to individual needs to improve the habits of life to alleviate, if necessary, go to the hospital for medical treatment.