It's simple really. I have had fever blisters all my life, and I read about this in a beauty mag, and it works. When you feel the blister coming on, put ice on it for 15 minutes (about the time it takes for an ice cube to melt). Wrap it in a paper towel, so it's less cold to the site. Do that again, about a half hour later, and it freezes the virus, and prevents the blister from forming. It's worked for me without fail for years, now! Good luck!
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