Help, i have a cold sore that needs to be cured!?

You could put aloe vera jelly on it, or even eucalytus oil. I don't think you should reschedule, even if it's not gone by Saturday. If he doesn't like you just because of a cold sore, you'll know he's just a jerk. I don't think he'll notice it anyways, just conver it with concealer, and don't mention it. Don't point it out, or say "I know the cold sore's gross". I did that once and he said "Oh, I didn't even notice it. I do now that you've pointed it out though". So don't point it out :) Good luck xx