I haven't had shingles myself but this is what I found on webmd,
Shingles blisters usually scab over in 7-10 days and disappear completely in two to four weeks. In most healthy people, the blisters leave no scars, and the pain and itching go away after a few weeks or months. But people with weakened immune systems may
develop shingles blisters that do not heal in a timely manner.
I assume you went to your doctor for treatment for them?