The child is three years old, said to be hand, foot and mouth disease, the day before yesterday has begun to have a low fever, yesterday, do not like to eat, today see his mouth have some white spots, hands and feet on the buttocks are all there, the night to see the old drooling. His face is swollen, is it serious? Hand, foot and mouth disease (HFMD) is an infectious disease caused by an enterovirus.