How to prevent cold-sores?

I was just wondering how to prevent these things, to stop them before they come up. I know stress and a low immune system is what causes them, but is there any specific precautions take take so they don't develop?? And where do you get cold-sores? Most people get them on the mouth/lips, but I get them on my... show more I was just wondering how to prevent these things, to stop them before they come up.

I know stress and a low immune system is what causes them, but is there any specific precautions take take so they don't develop??

And where do you get cold-sores? Most people get them on the mouth/lips, but I get them on my chin under my mouth, is this normal???
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