cold sores
"I find this the only treatment which can nip a cold sore before it develops. If one does develop, it also eliminates the pain faster (2-3 days) than any other creams I've tried. I also discovered after more than five years of annoying outbreaks that cold sores in the summer actually came from sunburned lips. Once I started to completely cover my lips before spending time in the sun, they did not come back. Here, prevention is the key."