usually affect a certain part of the body in a very specific distribution depending upon the nerve
supply to that area. So i agree with you doesn't soud like Herpes
There are two things in my mind what it could be,
1: Urticarial Vasculitis(a form of cutaneous vasculitis,an inflammatory condition of the skin vasculature due to a variety of causes).
2:Bullouse Lichen Planus
(another chronic inflammatory condition of the skin).
At this point i would have asked you few questions but as you know its not possible at the moment,so i would stongly suggest to consult a dermatologist
because it needs a proper investigations before reaching to a conclusion.
I hope you understand my point and find this answer helpful.