You use Abreva. It is the only cold sore medicine that i would recommend. It works extremely fast and you could have it gone in less than a week. If your cold sore has not even already started and you feel a tingling sensation on your lip, you are most likely to get a cold sore in the next few hours. The best thing to do then is to use Abreva and/or put cold ice onto your lip. I hope that helps. (:
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