Oral moss clinically refers to oral lichen planus, a disease of the oral mucosa. Most of the lichen planus is in the benign process, very few erosive type will be cancerous, but after surgical excision, the patient can generally survive for a long time. The majority of oral lichen planus is in a benign process, mostly chronic and fluctuating, but also need to be vigilant in the long-term ulcerated lesions and plaque-like lichen planus. Those who do not heal for a long time should be followed up, biopsied and biopsied for carcinoma if necessary, or the lesions should be surgically removed. Patients usually survive for a long time. If you have oral lichen planus, it is advisable to consult a doctor and undergo appropriate treatment as soon as possible.