The reason for the blackening of the male lips is the following: 1, liver reasons: mostly seen in men suffering from hepatitis B, or alcoholic liver caused by long-term drinking, the liver is an important detoxification organ, once damaged, their own detoxification system will be damaged, toxins can not be eliminated, the appearance of black lips. 2, kidney reasons: mostly seen in men with kidney deficiency, nephritis, and even serious uremia. For men, overwork or negligent maintenance of the kidneys can cause the lips to turn black. 3, circulatory system diseases: more common is coronary heart disease, angina, and even stroke, etc., the circulatory system has stagnant blood, and the lips appear black.