The incubation period for chickenpox ranges from 11 to 21 days. Prodromal symptoms consist of low-grade fever, headache, anorexia, and malaise. On the following day, the characteristic rash begins to appear.
The rash evolves from erythematous macules to form small papules. Quickly, a clear vesicle arises on this erythematous base. Over the next several days, the vesicles rupture and then crust.
Then the rash begins on the chest and back and spreads centrifugally to involve the face, scalp, and the extremities.
To learn more you should go to a medical professional.
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