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I have cold sore. I happen when I cut down on sleep or I get a regular cold.
I was getting worse 7-8 times per year and sometime as much as 1/2 inches in size.
But I talk with my doctor, and he prescribed Valtrex. I take them when I feel the sore is coming, and it really help reduce the size of the sore and the recovery time.
Unfortunately, it something that lay dormant and will always come back.
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