For the past two weeks I've had a weird taste in my mouth - you know the taste when you get up in the morning? It's that, but it's always there and no amount of toothbrushing will get rid of it.
I was at the dentists the other day and she noticed a white spot in the back of my throat, she said just to watch it.
I'm curious as to what it may be? It's just one, and it's in this little groove just behind that dangly thing. It looks like a zit almost. I can't feel anything.
Here is a blurry picture (its hard to get a pic of your mouth!) but you can see it

http://img27.imageshack.us/img27/8751/uh007.jpg

I think you need your doctor to see that. If it was me, I would ask him to take a culture, or even a biopsy. You will never know what it is unless it can be examined.

Tonsil Stones (Tonsilloliths): Treatment and Prevention
This may help answer your questions.