Adult chickenpox is usually most severe 3-5 days after the rash appears, and the more dangerous condition is the development of complications such as pneumonia and encephalitis, which can occur at any time during the course of chickenpox. In adults, chickenpox is usually more severe than in children, with the rash gradually increasing in the first 3 days, peaking at about 3-5 days, followed by the development of red papules, herpes, crusting and remission, and lasting 10-14 days. When most of the body rash is in the chickenpox stage, it is prone to pneumonia, encephalitis and other more dangerous complications, but the specific day of chickenpox is the most dangerous, there are differences in each person, can not be generalized, in fact, the time of chickenpox complications is not fixed. The actual fact is that the complications of chicken pox are not fixed. After getting chicken pox, you must go to the infectious disease department of the hospital in time for treatment.