White thing in my throat.?

I have a white bump in the back of my throat. I cant really even call it a bump though. It doesn't hurt or anything. It actually feels like a piece of food that never went all the way down and is just sitting there attached to my throat. I can feel it with my tounge. Im not sure what the heck it is, so if someone could help me I would appreciate it very much. Thank you , Kellie