What Causes Blisters In Between Vagina And Anus Post Rough Sex?

Hello, I recently had very very vigorous sex, and he wore a condom. However I was very dry and he did not use lubricant. It hurt so badly I had to ask him to stop, and when I looked at my vagina in the morning, there were several large (2-3cm) open blisters. I know for sure they were not there before, but there are maybe 5 or 6 of them around the bottom of my vagina and in between near my anus. Could this be herpes? Does an outbreak happen in one day? Or is it a friction burn?