When a child has herpes inside the mouth, the following treatment measures can be taken separately: First, when the child is younger, anti-inflammatory and antiseptic drugs can be rubbed on the lesion area, such as rehabilitation new solution, gold throat health, etc. to speed up the healing. Second, older children can rinse chlorhexidine solution to reduce the retention of plaque, if necessary, oral antiviral drugs such as Banlangen and Dazhongye. Third, when the child has an elevated body temperature, the fever should be promptly reduced and fluids should be replenished. Fourth, when the herpes breaks down to form a vesicular surface, erythromycin ointment can be applied to prevent bacterial infection, and the use of corticosteroids is prohibited. The child needs to drink a lot of water, eat more nutritious food, take vitamin supplements, ensure adequate rest, strictly disinfect the utensils and water cups used by the child, and change clothes in a timely manner.