Shingles is a common viral infection that targets the skin, and nerve fibers. It causes a painful rash-blister due to the same virus that causes chickenpox (varicella-zoster virus). After a person recovers from chickenpox, the virus usually remains dormant or inactive in the body for the rest of his life; but for an unknown reason it can become reactivated later in life causing shingles. The rash typically involves one side of the body, and takes the shape of a band-like pattern.