Shingles is a type of viral infection caused by the varicella-zoster virus—the same virus that causes chickenpox. After you recover from chickenpox, the virus stays in your body and can reactivate later in life as shingles.
It typically appears as a painful rash on one side of the body, often forming lines of sores. The condition can take several weeks to heal and may lead to complications if not treated promptly.