cold sores
"I get a cold sore 1 or 2 times a year, and it quickly spreads to a big sore and then leaves scars.  I began taking Valtrex and immediately within 2 days it was under control.  The next time I felt that tingling I began using it right away and the next day it was pretty much gone.  My Doctor also gave the the ointment to put on my lip which helped 2 x.  This is a great medication."