If you want to eliminate the symptoms of the black corners of the mouth, you have to find the cause of this situation and then treat it according to the disease, as follows: 1, if there is no discomfort when the corners of the mouth are black, consider that it is caused by a vigorous beard, which is harmless to the body; if you feel that it affects the beauty, you can use a razor to shave or go to the hospital to do hair removal surgery to permanently remove the beard from the corners of the mouth; 2, the corners of the mouth are black and the affected area is itchy. The symptoms of skin thickening, consider limited dermatitis, available yellow skin ointment, Likang cream ointment to rub the affected area; 3, if the symptoms of acne or herpes simplex before the affected area, consider the pigmentation caused by the skin color can gradually return to normal after 3-6 months; if you want it to quickly fade, you can use vitamin E to rub the affected area, eat more tomatoes, oranges and other foods with high vitamin C content.