There are generally two reasons for blisters on the mouth. One is the lack of certain vitamins (usually B vitamins B2) in the body, and the other is excessive internal heat caused by fatigue or toxins in the body. The solution should be adjusted internally and externally. On the one hand, it is necessary to keep the blisters clean, and it is forbidden to buckle or peel them by hand to avoid bacterial infection. Apply some external medicine. It is recommended to use watermelon frost spray or drink honey water, which has a very powerful function of removing fire. You can also eat more cool things such as turtle ling cream, herbal tea (wild chrysanthemum, coptis root and honeysuckle), carrots, grapefruit and cucumbers. Pay attention to have a good rest, have more fun and keep a good mood, and you will be fine soon.