I had shingles awhile back. It usually is only on one side of the body and runs along a nerve. It's very very painful. I felt numbness in the area (right rib cage) before the rash manifested.
I got the pharmaceutical within 72 hours because shingles can turn into long term post-neuralgic pain that lasts forever. There are very few pharmaceuticals I'd ever take but this was one of them. I totally hedged my bets on this.