Wish I could help, but you can see the lesion and I cannot; i.e., you're a better judge than I can be whether it is due to abrasion. Herpes doesn't usually appear as just a "red bump"; see other threads (and the herpes article in the link "STD Quick Facts and Articles" at the top of the STD forum) for more complete descriptions of herpes. If in doubt, see a healthc are provider.
Good luck-- HHH, MD