I have a small, tooth sized white patch behind my furthest molar on the gum, on the right side of the mouth. It feels a bit sore when i touch it with my tongue. It first started to form a couple of days ago when i felt pain brushing my teeth one morning. I think it may be a scab from eating chips, although i don't remember receiving the feeling of cutting my gums. It doesn't seem to be permanently there and feels kind of "loose" like a scab, and I am able to scrape it off, since I did this thinking it was food at first. So I'm just wondering if my prediction is correct and that it is a scab, or it could be plaque, etc. Thank you.