| You could be run down, sometimes my lips swell and burn whenever I'm stressed. Maybe its a blind boil under the lips surface, usually cold sores have a head and they tingle they can form into a cluster of blisters and are very uncomfortable, what ever don't touch them or they will spread that's only if you think that its a cold sore. It mite even form into a cold sore over the next few days. If it does you can buy some cream called zovirax from the chemist, this stops the cold sore forming.
Hope this helps. | 
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