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Back in the day, people thought that if an antiseptic didn't burn, it wouldn't work. Just because it burns doesn't mean it will do any good! Cold sores are caused by a virus so you won't kill the virus without killing the cells that it is invading. What the alcohol will do to the sore is to irritate the sore, dry it out on the surface and make it crack open even worse. If you want pain, rub some tobasco sauce on it...that won't cure it either but at least it isn't toxic.

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Q: Can you use rubbing alcohol on a cold sore?
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