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Are you able to post a picture of the rash? Although it is possible to be herpes, there can be other possibilities as well. In fact ingrown hair, sebaceous cysts are more common causes. Best wishes,It was my pleasure to help you today.If I have answered all your questions, Please rate my response Excellent (click on the 5th star on top).Please bookmark my profile for fast, reliable authentic answers!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/
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If she did not have active lesions, then the risk of transmission is low with use of condoms.
Yes that is possible with herpes having a long incubation period. You do have unprotected sexual intercourse with your current girlfriend. If she had prior exposure to herpes, that can be transmitted even without any symptoms by the way.
Yes this looks like herpes. However it can still be bacterial infection --hair follicle infection. Better to get this checked by your doctor. In case, it is heres, unprotected sex more than one time with same partner is more likely the cause than just one night stand with condom.
Yes that is quite possible. I will suggest both of you to get tested for herpes for confirmation.