herpes simplex
"I've used Abreva before but it didn't work as affectively, perhaps that was because I used it probably 2 days after my cold sore had already began to swell up/blister. This time around, I woke up to work and felt that tingling feeling on my top lip - knowing it was a cold sore. I treated it with my Burt's Bees chapstick throughout the day at work. It wasn't until late evening when I did a Target run to get Abreva. I applied it right away and probably 3x that night. It's been 3 days and my cold sore has reached the point where my blister could be picked off and healing. I applied it at least 5x a day, every 3hrs. I'm very satisfied! My cold sore skipped the whole stage where it plumps up, like a BIG BUMP on my lip, went straight to the blist"