I've noticed irritation towards the back of my mouth the last day or so when chewing/swallowing. When I took a look (which was really hard because I had to look all the way back where the tongue meets the cheek), I saw a small, thin blister-like area - it was pink - same color as the surrounding tissue, only a little darker. I've never had this before, so I'm not sure if I should be worried about it and go see the dentist or doctor, or just give it a couple days. Your thoughts?