herpes simplex
"I used to have cold sores all the time when I was a child, either when exposed to too much cold or when exposed to too much heat. Finally, I found a doctor who gave me a prescription (just a few years ago, I'm already an adult) and the Doctor prescribed Zovirax 200 mg 5x a day for 5 days. When I am able to take the medicine as soon as I feel the blister forming, the blister will only last for a day; it will grow and then burst and crust over within twenty four hours, so I've never really had to take the medication for more than 2-3 days. Very thankful for this medicine."