What is the process of chickenpox?

Chickenpox is an acute infectious disease caused by the initial infection of varicella zoster virus. Generally speaking, the incubation period of the disease is 12-21 days, and the onset is relatively acute. The rash will appear within 24 hours of the onset, showing a concentric distribution. The rash will appear in batches during the eruption period of 1 - 6 days, and will gradually improve in about two weeks.