Ulcerative stomatitis may be caused by bacterial infection, oral impurity, etc. It can be treated by oral medication and good oral hygiene habits. 1. Bacterial infection: usually bacterial infection is the main cause of ulcerative stomatitis, the common bacteria that induce ulcerative stomatitis include Staphylococcus aureus, Pseudomonas aeruginosa and so on. Usually after entering the mouth, these bacteria will multiply in the mouth and then induce ulcerative stomatitis. Patients can take drugs under the guidance of doctors, such as cephalosporin and so on. 2. Oral uncleanness: Oral uncleanness is also the main reason for ulcerative stomatitis, poor oral hygiene habits will lead to unclean mouth, easy to breed bacteria. When bacteria multiply, it will lead to ulcerative stomatitis. Patients should use medication under the guidance of a doctor to avoid private medication, leading to adverse effects.