Early prevention if exposed??

[brittany]

I was finally getting over all of this herpes stuff- I thought i had it, just w/ no sores and thats why none of the gynos could find out what the problem was. Then one gave me a blood test, herpeselect elisa - hsv 1 and 2 neg, no igm or iggs detected, and this was at least 3 months after any possible exposure. i was so relieved, so happy, for 2 weeks exactly. My younger sister's prom was on friday - went w/ my whole family to take pics, ect. I get to her best friends house and the father walks up and plants a huge kiss on my cheek - and i look up and there is this cold sore staring back at me! It looked almost black, nearly the size of a dime - like a dried out blister at the edge of his lip. He's middle eastern so he has fairly dark skin and i keep trying to tell myself maybe it was a mole, maybe he cut himself shaving- but after being so paraniod before i did so much research and i pretty much know what they look like, ive seen blackish ones on the web. My question is - if i was exposed, is there anything i can do before my first outbreak to prevent my body from getting this virus? i already have exzema on my lips, i deal w/ that, its not contagious. Also, my dermotologist told me it only attaches to a mucus membrane or a cut in the skin - i was also told that my the std hotline - but the first sentence in richards article is that thats the biggest myth about herpes - its through direct skin to skin contact and even if my cheek was completely intact, i can still get it that way. I hate this virus, i was finally fealing better, now this. Any ideas about early prevention or how its transmitted? and w/ my atopic dermotitis (exzema) i read it can be life threatening. I want to call this man up and just ask him what that was - but my sister would kill me and i know myself thats crazy, but now i am going to live in hell (my choice, i just cant handle germs in general and an incurable virus is my worst nightmare ) So thats all - any ideas let me know, thanks.