If you had chickenpox as a child, you might recall the itchy, spotted rash that popped up on your face and body. The varicella zoster virus that causes chickenpox stays inside your body for many years.
Once you're older, that same virus can wake up and cause shingles It gives you a rash, too, but it's often more painful than itchy.
A blistering rash on one side of your body can be a sign you have it. See your doctor to find out for sure. Once you've been diagnosed, you can get treated to help relieve your rash and other symptoms.