Green spot in my snakes mouth?

Well I was checking to see how my bp was going with her today shed when I noticed while she was yawning I noticed an olive green spot (at least that's what it appeared to be) on the bottom right of her jaw on the teethline. It has never been there before from what i can remember and it doesnt seem to be botherig her. She's around 12-13 years old. I should also mention she hit the side of her cage with her open mouth (she's mean as hell when she knows foods coming).

Thanks, just wanted to see what others had to say before I start pestering her to open her mouth.

I have got to see a picture of that:O

Id say ol girls got an infection

False alarm fellas. I just checked her out closer and her mouth is perfectly fine. I don't know what the heck I saw, but it freaked me out a little. I've had her sense I was seven and I'm twenty know so she means a lot to me.