A meatus on the left wall of the mouth may be the cause of fibrous granulomatous hyperplasia, parotid duct papillae, or oral cancer. 1. Fibrous granulomatous hyperplasia: it is mainly manifested as the patient’s oral mucosa has granulomatous swelling and hyperplasia, etc. The color is relatively bright red, which may be due to the patient’s having traumatic ulcers and other diseases, and maybe it will lead to the symptom of a meaty lump in the oral cavity. 2. Parotid duct papilla: if there is a small meatus in the mouth, it is mainly due to the elevation of the mucous membrane of the parotid duct, forming the parotid duct papilla, which is generally benign tissue and usually does not need special treatment. 3. Oral cancer: the flesh bumps in the patient’s mouth, such as manifesting as cauliflower-like changes, some patients are also accompanied by oral ulcers, and the initial manifestation is proliferative hard nodules in the oral mucosa. Patients should have a light diet in daily life, avoid eating spicy and stimulating food, and seek medical treatment when symptoms worsen.