Q. You know how people get black heads and they pop them, and this yellow stuff comes out? Well, I had something similar, but I don’t think it was a black head, and it was in the back of my mouth. It felt like it scratched my throat. I looked in the mirror and saw a yellow spot on one side of my mouth in the back. I took my finger and tried to see if it was food, but couldn’t move it. I pushed up from under it, and whatever it was came out. Kind of like popping a blackhead. I can see a hole back there where it was. I don’t know if I should be concerned about it or not. Any ideas what it could be?