cold sores
"In the past, whenever I would get a fever blister it was awful.  The lymph nodes in my neck would swell to the point it was painful to turn my head sideways. The fever blister was always at the corner of my mouth. My entire bottom lip would swell up and the blister itself would be so big and painful that it was difficult to open my mouth wide enough to eat. My doctor gave me a prescription  with additional refills for valacyclovir. About a week ago I felt a fever blister starting to form, so I took the valacyclovir as directed and the results have been amazing! The fever blister never got any bigger than it was that very first day. Neither my lip nor my lymph nodes swelled and you can hardly even tell I have a fever blister."