Blisters can cover the whole body including inside the mouth, eyelids, and genital area. It generally begins 14 to 16 after being infected. It usually lasts for 5 to 10 days. A person is contagious from one to two days before the rash appears until all blisters have formed scabs. Pregnant women, adults, babies, and people with weakened immune systems are at risk for serious complications.
Serious complications are: