Hey Corbra,
Won’t help you much now but whatever you do, DO NOT TOUCH IT! Especially when you are getting that tingling feeling on your lip as its just beginning to form. The less you touch it the smaller it will be and the faster it will heal. Abrieva seems to work but frankly I think it just an incentive for you to stop licking and biting the cold sore and let it heal by itself.
Cold sores are caused by a variant of the herpes virus, the virus never leaves your body and manifests itself when your immune system is weak or by exposure to the sun. The immune system can be weakened by stress, a poor diet or another sickness. If you get them often take it as a sign.
If it doesn’t go away by the day of the date you can always go to a chick friend and ask her to cover it up for you. Just make sure she knows what she is doing otherwise you will be leaving lipstick on the girl, and thats might be strange
