Cracked corners of the mouth is an inflammatory disease that mainly manifests itself as red cracks on the outside of the lips. The main cause of cracked corners of the mouth is mainly caused by bacterial infection and may also be related to the patient’s own condition. When saliva gathers in the corners of the lips, it causes the lips to crack, and this is the time when people lick their lips as much as possible to try to relieve the pain and dryness of the lips. This produces a lot of excess saliva, which in this case provides a comfortable environment for some bacteria to survive, and this time inflammation occurs in the corners of the mouth, and cracks in the corners of the mouth will follow. After appearing, the lips are exposed to some viruses and bacteria will lead to a serious situation. Some people’s physiology can also cause the person to be more likely to suffer from the disease. If a person’s upper lip hangs over, creating a deeper angle at the corners of the mouth, this time such a person will accumulate more saliva, which in turn will cause an infection to develop the problem of cleft mouth. There are some people who have sensitive skin, and when exposed to some substances, it causes symptoms of inflammation, and people with this condition usually have this problem. The main reason for the fissures at the corners of the mouth is related to bacterial infections, bacteria get a suitable living environment will grow in large numbers, while some people’s physical problems can also cause the appearance of such problems.