The white mucus often in the corner of the mouth is most likely caused by the mucous membrane of the lips peeling off and accumulating in the corner of the mouth, and there is also the possibility that the patient has chronic labyrinthitis or orchitis. In the case of chronic labyrinthitis, most of them are related to sun exposure, although it is a disease of the immune system. If the patient can pay attention to the protection of the lips, the chronic labyrinthitis will gradually heal. In the case of corns of the mouth, most cases are caused by a lack of vitamins. Patients can take oral multivitamins for treatment, and if necessary, they can go to the hospital for a clear diagnosis. The corner of the mouth always has a white slime can also be considered a fungal infection, because candidiasis is also white filamentous, you can take the local filamentous for patch examination. If it is a fungal infection, it must be treated promptly with alkaline medication.