The location is a bit odd, but herpes is possible. Next time you get the rash, go immediately to the dermatologist and have them do cultures for fungus, bacteria, and HSV. You could also have a type specific herpes test, but it will not tell you if the rash is due to herpes.
I agree, HSV-1 is not likely the cause of your rash. Next time you get it, try to get a culture done. Even if your rash is caused by HSV-1 (which I do not think it is), oral herpes is not considered to be an STD.