The incubation period of chickenpox is 10-24 days, after the incubation period is over, the patient will enter the 1-2 week onset period, this period is also the infectious period of chickenpox, children mostly directly into the rash stage, adult patients can appear low fever, fatigue, anorexia, chills and other general symptoms, can last 1-2 days after the rash. The rash first occurs on the trunk and head, gradually expanding to the face and finally the extremities, usually more on the trunk and less on the extremities and face, with a centripetal distribution, the rash starts as a pink rash, becomes a papule after a few hours, and then becomes a herpes after a few hours, the herpes is filled with fluid, the entire course of the disease 1-2 weeks, the disease can be seen at the same time spot rash, papule, herpes and crust rash, oral cavity, pharynx and vulva, etc. The rash can also be seen on the mucous membranes of the mouth, throat and vulva.