This might be something absolutely stupid and childish, but I'm sort of in the middle of a small panic outbreak and thought I'd just ask here instead of googling and making matters worse (let's say I just looked at the first page results and closed it instantly haha). I decided to look around my mouth because I've been having a bit of dull toothache - probably from my dodgy sinuses - and I shined a bit of light inside. And there's a yellow patch at the center of the roof of the mouth? And by that I mean the skin's turned that colour, it's not like build up of dirt or anything. Is this just normal discoloration or something a bit not so good? I do have constant post nasal drip so I don't know whether that contributes to anything?
P.S. Just noticed I may have posted this under the wrong section, sorry if so!