The rash of chickenpox is mainly seen on the trunk and head, gradually spreading to the face and finally to the extremities. The distribution of the rash is more common on the trunk and less common on the face and extremities, with a centripetal distribution. It starts as a pink, pinhead-sized rash that turns into a papule after a few hours, and then into a blister after a few hours. The blisters start as clear beads of water and later become cloudy. The walls of the blisters are thin and break easily, and after breaking they crust over and usually fall off in 1-2 weeks. There is no secondary infection, no scarring, and the mucous membranes of the mouth, pharynx, and vulva can also develop a rash. In the early stage, the rash is a small red papule, which quickly turns into a blister and then ruptures into an ulcer. After having chickenpox once, you usually do not get chickenpox again, but many people develop shingles when their resistance decreases.