Campho phenique? cold sores?

I have a really bad cold sore in my mouth and so we went to the drug store and the pharmacist told us to use this campho phenique stuff. I used it, and it seems to be working but i read the warnings and it says for EXTERNAL use only. Does that mean I'm not supposed to be putting it in my mouth? Also it says... show more I have a really bad cold sore in my mouth and so we went to the drug store and the pharmacist told us to use this campho phenique stuff. I used it, and it seems to be working but i read the warnings and it says for EXTERNAL use only. Does that mean I'm not supposed to be putting it in my mouth? Also it says don't use it over large areas of the BODY. Can someone tell me what it means or if I'm not supposed to be using it in my mouth?
(sorry for my bad spelling lol)
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