Gum swelling and pain with mouth ulcers is usually caused by ulcer infection, the treatment is mainly used for topical administration and oral medication. 1. Topical medication Topical solution containing chlorhexidine gargling, ulcers can be coated with iodine-containing preparations, topical dexamethasone ointment, tretinoin oral ointment, ice boron powder, watermelon cream spray and so on. If the ulcer pain is more intense, you can use topical lidocaine gel to relieve pain. 2. Oral medications (1) Antibiotics: cephalosporin antibiotics, such as cefradine, cefdinir, cefixime. Macrolides: Erythromycin Succinate, Roxithromycin. Quinolones: levofloxacin, norfloxacin and so on. Anti-anaerobes: metronidazole, tinidazole. The use of antibacterial drugs need to comply with medical advice. (2) Glucocorticoid: such as prednisone, dexamethasone, and so on. Gum swelling and pain as well as mouth ulcers are recommended to consult a doctor in time, after clarifying the cause of the disease, under the guidance of the doctor for treatment.