When a child has blisters in the mouth, the following treatment measures can be taken: 1. When a blister ruptures, a compound boric acid solution can be applied for wet compresses to encourage scabs to fall off, and the lesion area should be kept clean to prevent infection. If there is no obvious exudation, you can apply herpes net, and older children can gargle with a solution such as compound chlorhexidine gargle to reduce the retention of food residue and soft dirt. 2. ensure that the child gets enough sleep and rest, and supplement a lot of food rich in vitamins and protein. 3. if the number of blisters in the child’s mouth is high and causes an increase in body temperature, physical cooling can be performed. If the blisters become infected, antibiotics can be applied. 4. Ventilate the child’s room regularly, dry clothes, disinfect dishes and toys, etc.