The peak of chickenpox usually occurs on the 3rd-4th day of chickenpox, when a large number of new chickenpox grows and the old chickenpox has not yet crusted over. Chickenpox is a viral infectious disease, mainly through respiratory droplets and direct contact transmission, the onset of disease is more acute. The virus invades the body through the upper respiratory tract, oral cavity, conjunctiva or direct contact with herpes fluid. There is a certain incubation period, mostly in 10-21 days after infection with the virus began to appear symptoms, such as fever, sore throat, general malaise, loss of appetite and so on. And 1-2 days after the appearance of the first symptom, there will be a rash with flat or slightly raised erythema, accompanied by fever, if there is a high fever, it needs to be treated symptomatically, and if it is itchy, it can be combined with antihistamine medication and avoid scratching. It usually peaks after 2-3 days and gradually recovers. However, it should be noted that when suffering from chickenpox generally need to be isolated for treatment, most of the children with good treatment results, but some of the more serious patients can be complicated by laryngitis, pneumonia, myocarditis, encephalitis, and even viral encephalitis.