This does not sound like herpes at all. Blood tests are not useful for HSV1 (a positive test as you had doesn't mean that you have active herpes, only that you were exposed somewhere at some point.) If one doctor things it's that, he or she should confirm it with a culture of a blister, but I really doubt that's the cause.
As to what is the cause, it sounds like a form of eczema. Allergy to a specific product is uncommon, but would have to be considered. Patch testing may be worth considering, as well as topical therapy.
At a minimum, you should have your doctor tell you for sure one way or another that you don't have herpes, so you can take it off the agenda.
Best.
Dr. Rockoff