Oral mucous membrane black spot generally will not disappear by itself, it is mostly considered to be caused by melanin deposition in oral mucous membrane and bruising, but the possibility of nevus and melanoma cannot be excluded. 1. After the oral mucosa is damaged due to trauma, black spots may be caused by bruising in the damaged area, generally it is not recommended to target treatment, and the phenomenon of black spots may disappear naturally after the damaged area is recovered. 2. When the pigment cells in the oral mucosa are stimulated by internal and external factors, melanin deposition may occur, leading to the phenomenon of dark spots, generally there is no need for targeted treatment, and patients can eat more fruits and vegetables rich in fiber and vitamins as appropriate. 3. In addition, pigmented nevus and melanoma may also lead to the appearance of black spots in the oral mucosa, it is suggested that patients can go to the hospital for examination, and after confirming the diagnosis of pigmented nevus and melanoma, under the premise of meeting the indications of surgery, patients can consider using the surgical way to be excised.