Oral ulcers are commonly treated with topical glucocorticosteroids, and for those with severe symptoms and frequent recurrences, a combination of topical and systemic medications may be used, as described below. Commonly used topical glucocorticoid drugs include tretinoin oral paste, dexamethasone ointment, spray, gargle, prednisolone ointment, betamethasone gargle, hydrocortisone mucus tablets, fludioxonil ointment, beclomethasone propionate cream and so on. If the symptoms of oral ulcers are more serious or recur frequently, you can combine systemic medication on the basis of local medication, commonly used drugs are glucocorticosteroids, such as prednisone, dexamethasone, etc., immunosuppressive agents, such as azathioprine, cyclophosphamide and so on. All of the above drugs should be used under the guidance of a doctor, and it is recommended to go to a regular medical institution to receive professional treatment.