The rash of chickenpox does not necessarily cover the whole body. At most, the rash does not reach the palms of the hands and feet, which is not considered a full-body rash. In some people, the rash may reach the palms of the hands and feet, indicating that the disease is more severe. The rash of chickenpox appears first on the trunk and then spreads to the extremities. Later in the course of the disease, the chickenpox rash is more dense on the trunk than on the extremities. The rash on the extremities will not be particularly close to the hands and feet, but will be close to the back of the hands and feet, and will not grow into the palms of the hands and feet. The rash of chickenpox can be sparse or dense. Most of the chickenpox rash is accompanied by itching, the form of chickenpox will change from papules to herpes, the herpes may break or not break, the herpes fluid gradually decreases and dries up, it will become a crust, the crust falls off means that the rash of chickenpox enters a period of non-contagious.