Cold sores on lips?

Three days ago, I noticed i had 2 cold sores. I don't know where it came from. I don't think it came from kissing my girlfriend because she doesn't have any. But the next day, I noticed my lips were really chapped and i had 2 more cold sores(making 3 on my lips and 1 on my tongue). I asked my friend... show more Three days ago, I noticed i had 2 cold sores. I don't know where it came from. I don't think it came from kissing my girlfriend because she doesn't have any. But the next day, I noticed my lips were really chapped and i had 2 more cold sores(making 3 on my lips and 1 on my tongue). I asked my friend about it and she said to use Carmex, so I started using it.

How much carmex do i apply? How often?
Is cold sores on the lips really herpes?
Are there any other treatments besides lip balms?
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