Internal mark on PN50B650

[Mystique]

I got my B650 today and I thought everything was going well until I noticed a black mark on the bottom left corner of the screen. There is a little black mark that's internal. Like if you look at it from an angle you can still see the picture back there. It's just between the clear screen or whatever. What should i do? I tried wiping it off, but I realized it's in there... Now I have to go through the hassle of exchanging the set...