Swelling & numbness in cheek near mouth moving daily from one area to another.

I have swelling and numbness inside my cheek near my mouth that started yesterday at work. Yesterday it was above the left side of my mouth inside and eventually went away by late evening. Once I got to work today, the lower left side of my mouth began to get numb and swell. Looking inside my mouth at the swelled area, I do not see any discoloration. It's solely a swelling and numbness that was above the mouth yesterday and today is below the mouth on the left side. I always eat breakfast cereal with soy milk each morning and these days were no different. I also drink coffee in the morning. Any ideas on what this could be?

[cheeboon]

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