cold sores
"As a 20 year old girl, a huge, ugly cold sore is pretty much one of the most unsightly things that could happen to your face.  I've been getting them literally once a month since I was 11, guess I caught it at my gymnastics gym sharing water, and nothing has been more helpful than 2g of Valtrex at the FIRST sign.  No OTC treatment ever shortened my healing time, but Valtrex completely stops the blisters in their tracks. If I take it right when I feel the tingle/bump, it USUALLY never even breaks the skin.  I would highly recommend this medicine to anyone with a cold sore problem."