If a child has a fever and oral herpes, it is likely that the child has hand, foot and mouth disease. First of all, take the child to the hospital to confirm the diagnosis, if it is indeed infected with the hand, foot and mouth virus, it is necessary to give the child antiviral drugs for treatment, you can give the child oral busulfan anti-inflammatory oral solution or ribavirin granules. If the fever is more severe, with a body temperature of more than 38.5°C, the child should still be given fever-reducing medication, such as ibuprofen suspension or acetaminophen suspension. In case of HFMD with poor mental health, breathing difficulties or convulsions, it is best to take the child for hospitalization. Some HFMD attacks are more serious and may lead to cerebral edema, so hospitalization is safer.