The redness around chickenpox is caused by the dilation and congestion of the surrounding capillaries, which will gradually disappear. Chickenpox is a primary infection caused by varicella zoster virus, incubation period of 10 to 21 days, the onset of disease is acute, the clinical manifestations can be divided into two phases: the prodromal phase and the rash phase. Clinical manifestations can be divided into two phases: the prodromal phase and the rash phase. The prodromal phase is characterized by low-grade fever, chills and headache. Rash period at the beginning of the red rash, later developed into herpes, herpes is oval, surrounded by a red halo, for capillary expansion caused by congestion. The wall of herpes is thin and easy to break, often accompanied by itching. The red halo around the herpes mostly disappears after 1~2 days. Chickenpox is a self-limiting disease, most of which can get better on their own. Severe cases need to go to the hospital in time and follow the doctor’s instructions for active treatment.