Hey,On Aug 24th I had protected sex with a girl (Girl A). She gave me unprotected oral sex. On Aug 26th I had protected sex with another girl(Girl B). In this encounter, we performed unprotected oral sex on each other. On Aug 27th, I reconnected with a past partner from a few months back (Girl C). We had unprotected sex. After having intercourse with 3 women, I went to the doctor on September 2nd to get tested. On Sept 4th, Girl C contacted me saying she had pain on her vagina lips and was going to get tested. I received my results on September 8th showing I was negative for everything. A few days later, Girl C receives a positive test result for HSV1 on her genitals. That was the first time she was tested for HSV so she wasn't sure how long she's had it, or if I gave it to her in that encounter (we were on and off for a year). Only myself and another guy in performed oral sex on her. On Sep 20th, I felt some tingling on my lip that turned into a pimple-looking bump. It didn't look like any pictures of cold sores that I've seen. It look more like a pimple. I squeezed it and pus came out like I was popping a pimple. It hurt for a couple days. I applied come cold sore ointment on it for maybe 2 days. The bump and scarring lasted longer than the 2 weeks google said a cold sore is supposed to last so I wonder if what I had was a cold sore. I went to get tested again on Oct 8th, which is 6 weeks after the encounter (as recommended by the doctor). The doctor also said she didn't think it was a cold sore. That test result came back as negative. Should I wait the 12weeks to get tested again for the IGG? Should I get the Western Blot? Did I receive a false neg test result? Is it possible for someone to receive a negative result, not show symptoms but still transmit HSV to others? What is the likelihood that I was exposed to HSV 1 from Girl C, but didn't get infected (does everyone who is exposed to HSV 1, get it)?

It is difficult to say here who gave what to whom here but if girl C had only received oral sex from two people and you were one of them, it certainly could have been from you.  And I am somewhat concerned about your lip lesion but not overly concerned.  The IgG test misses 30% of HSV 1 infections compared to the gold standard herpes western blot so you could have gotten a false negative, yes. 

HSV 1 genital infection is only rarely transmitted via intercourse so no, it isn't a given that you have became infected genitally by partner C.  Not at all.  If you decide that you would like to get the herpes western blot at some point to know if you have HSV 1, you should wait 12 weeks from the timing of your sexual encounters (and I don't know what you've been doing since, either, that could put you at further risk.

Terri