cold sores
"I have been getting cold sores ever since I was 5 years old. The sores would pop up, swell and scab over. It was incredibly embarrassing to go to school with scabs on my lips for up to 2 weeks. When I was 14 my doctor prescribed me with Valtrex.  It doesn't prevent the sores but does boost the healing time, and make them less painful. The healing time is only about 4 days!"