Chickenpox is a self-limiting disease. When a 3-year-old child develops chickenpox, you need to isolate the child, avoid scratching the wound, and try not to bathe or wipe the child’s body, among other things. Chickenpox is caused by the herpes virus and is a self-limiting disease. However, chickenpox is contagious in the early stages, so it is important to isolate the affected child to prevent transmission to other children. When chickenpox occurs in 3-year-old children, there may be some itching. Parents should avoid letting the affected children scratch the wound, so as not to scratch the skin and cause bacterial infection. When a 3-year-old child develops chickenpox, there will be many skin lesions on the body, and parents should try not to bathe the child during this period. Otherwise, there is a possibility that the chickenpox may rupture and even cause infection. When a 3-year-old child suffers from chickenpox, it is recommended to bring the child to the doctor’s office in time and take care of him/her under the doctor’s guidance.