She has the lesions and the fever. Her pediatrician was so convinced it was not chickenpox that she did not even check the lesion that had the scab on it. The fact that your child was exposed to chickenpox may be the best clue. Chickenpox is one of the most common childhood illnesses. This highly contagious infection causes an itchy, blister-like rash that can cover most of the body.
Children often get a mild fever along with the rash.
After your child is exposed to the virus that causes chickenpox, it can take 10 to 21 days for the rash to appear. Small blisters, which may have a red area around them, will begin to appear on the body and scalp, then spread to the face and the arms and legs. Normally, the blisters will crust over and heal, but tiny sores and possibly small scars may develop if your child scratches them and they become infected. Check the calendar.