Could it be genital herpes??

I have had cold sores around my mouth from time to time since I was a child and my dr said it was from hsv-1. About 2 weeks ago I noticed a rash on my genitals, which was not itchy or red. It then spread to one butt cheek and the top of my butt crack. That area became itchy, red and had blisters very similar to what cold sores would look like. I went to the dermatologist and at first they diagnosed me with excema, but took a biopsy just in case. The test results came back for the herpes virus, but they did not test to see if it was hsv-1 or 2 (genital herpes). I have another dr apt scheduled to get a full std screen, but was wondering if hsv-1 (cold sores) could travel to the genitals and have an outbreak there without having oral or any type of sex with someone that was infected? I am trying to figure out how this could have happened if I have been with the same person for almost 20 years and she is negative for both types. 

Yes if you touch your cold sores on your mouth and touch you vagina, there is a chance you can catch it there. HV1 prefer to be on the mouth BUT you can still catch it on your genitals. First out break can take months or even years to first appear.

I'll say you have HV1 and not HV2 down there. What are your symptoms? Is it just one bump? Can you see vesicules in it? Do you have a photo