In the last year I have had a few occasions where I have had the inside of my cheek and the side of my tongue swell up. It is always the same side of my mouth. I was trying to pay attention and it seems to happen when using plastic straws, or that is when I seem to really notice it. Is this some kind of allergic reaction? It goes away pretty much by the next day, but takes a couple of days to completely go away. The inside of my cheek has a smooth feel to it, the last time I remembered to look at my tongue and it seemed to have white on it, a friend said it looked like I had burned my tongue. It is an odd thing and just wondered if anyone knows what this might be.