When you feel one coming on, use ice cubes and keep it there as much as possible for a couple of days. I had a cold sore one time, and it was a tough 2 weeks. Somebody told me the ice cube trick, and I haven't had one since -- as long as I can catch it early.
It sucked trying to eat, but the worst part was the feeling I had walking around my workplace with it. Thankfully, I had just started growing a beard.
Fun fact...about 80 to 90% of people carry the herpes simplex virus. Not all of them will see it pop up in their lifetime.
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