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Cold sores or fever blisters are caused by a virus that's spread by skin-to-skin contact with an infected person, at the location where the virus is active, during a time when they are shedding virus.

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13y ago
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12y ago

Don't share things like utensils or cups also don't kiss any one on or around the mouth when you have a fever blister. If you are sexually active then also don't give oral sex while you have any signs of a fever blister, they can be passed from your mouth to your partners genitals if you give oral sex while you have a fever blister.

It's safer to do those things when you don't have any signs of a fever blister.

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12y ago

Rub ice all I've your lip sould work

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Q: How do you prevent fever blisters?
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