Hello, first of all, are you sure of herpes zoster? Is it diagnosed? Secondly, if it's shingles you need to go to the hospital for other treatments, for it's kind of long, treatment such as some antiviral drugs. If it's not convenient to go to the hospital, you can also take oral antiviral drugs such as acyclovir, and take it according to the instructions. Usually, dry and clean gauze can be used to clean the blisters. I wish a speedy recovery.