Does your child have a rash? Red bumps all over the skin that leaves scabs? Does it look like chicken pox? Dr. Cindy Gellner thinks probably not. If your child received her standard 12-month immunizations, she has already received the chicken pox vaccine. The vaccine has a 97 percent effectiveness, so whatever your child has is probably something else and Dr. Gellner gives you some suggestions as to what it might be.