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Chicken
pox is an infection by a virus. It causes a fever
and an itchy rash. The rash starts as a small red bump, then turns
into a small blister in a short time. New blisters form for 3 to
4 days.

The
incubation time of chickenpox is 2 to 3 weeks. Chickenpox is contagious
from just before the rash, to 5 days later or until the blisters
are crusted, whichever period is shorter. It takes about 2 weeks
for the scabs to fall off.
Fever Control: