herpes simplex
"Abreva is the only cold sore cream I have found that works. I've been getting outbreaks my entire life. More so when I was a kid, now I get one outbreak about once a year. I apply the cream at the first sign of tingling and use it every 2 hours the first day while applying with a finger and washing my hands before and after. The second day I apply it every 3-4 hours. Abreva stops the spreading for me, the earlier I catch it the better. It also takes about 5 days to fully go away, if I don't use abreva it will stick around for up to two weeks."