Chicken pox is a common childhood ailment that is commonly recognized by a red rash and itchy pimples that may turn into blisters. Symptoms An itchy rash is observed on the body that starts on the back and legs and covers almost the entire body in a span of a few hours.The rash may turn into blisters.The entire ordeal lasts for 7-10days in children and may persists for a longer time in adults. Root causes The root cause of chicken pox is the virus varicella-zoster that may be transmitted through air and from one person to another.