Oral ulcers at the long a small meatball, usually oral polyps, the cause of its generation may be related to inflammation, trauma or tumor, as follows. 1. Inflammation: the ulcer is usually infiltrated with inflammatory cells and a large amount of inflammatory exudate, the surrounding oral mucosa in the long-term stimulation of inflammation will appear limited hyperplasia. 2. Trauma: some oral ulcers are caused by trauma, such as sharp tips, crowns, bad restorations, etc. These traumas not only lead to oral ulcers, but also lead to oral mucosal hyperplasia, the formation of polyps. 3. Tumor: It is necessary to pay attention to the presence of tumors, such as cancerous ulcers, etc. In addition to causing ulcers, it may also lead to tumors, presenting small meatball-like structures. If the above symptoms occur, it is recommended to go to the hospital in time, with the help of the doctor to clarify the cause of the disease, targeted treatment.