Drug treatment for bad mouth: firstly, if there is lip rupture and erosion, you can mix morning and evening topical comfrey oil and epidermal growth factor gel; secondly, patients can take oral roxithromycin capsules or ciprofloxacin tablets, and compound glycopyrrolate tablets, which can be cured after the above treatment for a period of time. If the patient has recurrent blisters with itching, he can take ganciclovir dispersible tablets and vitamin B12 orally, and then he can mix morning and evening topical application of penciclovir cream and skin cream; abstain from spicy food, abstain from alcohol, and abstain from intake of hot food.