Hi, what your describing would not appear herpes related at all as most often when one blister/razor type cut appears it opens and spreads the virus to the immediate surrounding area in a cluster type grouping and they dont clear up in a day, but they can be quite small and be mistaken for something else.
But considering youve taken antiboitics and mention it appears after a workout, it would really seem more connected to that.
I hope you're right. I'm probably worrying over nothing. Thanks for your response.