The severity is mainly related to the number of medications; there is a history of medication use prior to the onset of the disease, and the lesions heal quickly after discontinuing the suspected sensitizing medication. The severity of drug-allergic stomatitis is mainly related to the number of drugs, a history of drug use prior to the onset of the disease, and rapid healing after discontinuing the suspected sensitizing drugs. Drugs are human beings in the process of long-term struggle with disease constantly found, accumulated and enriched.