Q: I am 30 years old this year. I don't know why there have been blisters in my mouth for more than ten years, which are transparent and not very painful, but I feel very uncomfortable. I'll be fine if I puncture them with a needle. The oral mucosa often peels off. In severe cases, it will bleed and you can't eat irritating food. Excuse me, what is this? How to treat it? A: Hua Hong, deputy director of the Department of Mucosal Medicine, Peking University Stomatological Hospital, believes that there are two possibilities for your symptoms: one is virus infection. When the body's resistance is poor, virus infection often occurs, which is manifested as transparent blisters the size of rice grains, which can appear repeatedly and have an indefinite period. The treatment methods are antiviral treatment and local symptomatic treatment such as gargling. The second type is mucocele. It may be that the small salivary gland has mucinous cyst due to catheter obstruction and other reasons, which can recur and the site is fixed, usually blister, which is related to eating. The treatment is surgical resection of the lesion. I suggest you go to a nearby stomatological hospital for treatment the next time you get blisters. (Li Xiaohong)