Hand, foot and mouth disease is an infectious disease caused by enterovirus infection, characterized by herpes on the hands, feet and mouth, with or without fever. Depending on the severity of the HFMD virus in the baby, as well as the age of the baby, and the immune function, the performance is different. If older babies have better immune function, they may not have fever, but only have mild herpes on the cheeks and herpes on the hands and feet, which can be cured by oral antiviral medication and antiviral sprays sprayed on the herpes. In the case of small infants, young babies, and those with weakened immune systems, herpes can be accompanied by fever in addition to herpes on the hands, feet, and mouth.