Hi. For the last two months I noticed a white patch with a red border behind my tonsil going down my throat. It cannot be scraped off. I have this on both sides but it is more prominent and white on my left side. It is not to be confused with a tonsil stone as it is not on the tonsil. What could this be? I am going to an ent next week but just would like to get an idea for my own piece of mind.