Chickenpox is a symptom that occurs after infection due to the chickenpox virus, and most people will appear to have chickenpox around the second day of fever. However, there are some people whose fever may not be so obvious because of their constitution, especially some elderly people, or infants and children, those with poor constitution and malnutrition may have chickenpox directly without fever, but this type of patients is relatively rare. The majority of patients will have a pox rash or accompanying pox rash in the first two days after the fever, so generally 70 to 80 percent of patients will have a fever, but not except for some immunocompromised patients may not have a fever, this situation is not necessarily not chicken pox, need to be analyzed specifically.