You CAN get shingles without blisters.
Zoster sine herpete is a form of shingles that appears without a rash. It is uncommon.
Though it is possible to get shingles without blisters, a rash with blisters is one of the main symptoms of shingles. If you don't have a rash and suspect shingles, it is more likely that you are in the beginning stages of the condition.
Shingles with Delayed Rash
When shingles first appear the symptoms may not include a rash or blisters, which can take anywhere from 1-14 days to appear. The first signs of shingles are often mild and many times go unnoticed until the rash appears. Early shingles symptoms are usually isolated to one side of the body and can include a burning sensation, sharp pain, or itching. Shingles can also mimic flu-like symptoms such as fever, chills, and nausea. Once the rash appears, the blisters usually follow a few days later.