The corners of the mouth are black because of the following factors: 1, because the mouth is often susceptible to infection by bacteria, viruses, fungi or other pathogenic microorganisms, if the corners of the mouth are black along with black around the lips, as a result of infection factors, you can first take certain oral anti-inflammatory drugs, recommended to take cephalosporins and beta-lactams, which belong to the broad-spectrum class of antibacterial agents. 2, if the corners of the mouth are black belong to, for example, the heart blood supply factors, because the blood supply of the aorta is not sufficient to lead to insufficient operation of Qi and blood. If the black corners of the mouth are caused by factors such as inadequate blood supply to the heart, because of insufficient blood supply to the aorta, you can take drugs to improve the blood supply to the heart, such as compound salvia drops, Qishen Yiqi drops, etc. can alleviate the above symptoms. 3, if the black corners of the mouth are caused by severe lack of oxygen, cyanosis, can be relieved by oxygen therapy, can be performed at home oxygen machine or oxygen bag oxygen therapy, or to Hospital hyperbaric oxygen therapy.