Spots on the top of the mouth may be caused by dark spot polyp syndrome, pigmented nevi, and lipitis.
1. Black spot polyp syndrome: black spot polyp syndrome belongs to hereditary disease, clinically manifested as black spot pigmentation and polyps in the gastrointestinal tract. Most of the black spots of skin and mucous membrane pigmentation will appear on the lips, tongue and other parts of the body, affecting the aesthetic appearance.
2. Pigmented nevus: pigmented nevus is a kind of benign new skin organism caused by nevus cell proliferation, which occurs from infancy to old age. It can occur in the lip area and manifests itself as a black patch with uniform color and clear boundary.
3. Lipitis: Due to the long-term repeated inflammatory stimulation of the lip area, such as lipitis, it will lead to pigmentation, thus appearing the phenomenon of plaque above the mouth.
Therefore, when the patient appears above the mouth long spot, should consult the doctor in time, by the professional doctor clear diagnosis and treatment.