Samsung: off color splotch on screen

off color splotch on screen

I have a Samsung LCD 46" TV. Off the top of my head, I can't recall the model #, but I'll look it up at home.

There is a splotch (no better way to describe it) on the left side of the screen that is off color. When the screen is a flat, bright color like white, the splotch looks a tiny bit gray (off white). Enough that is it noticeable. I first thought someone wiped a cleaning solution on it, but after going over it, it is not on the surface of the screen, but is part of the image. It is really noticeable when the colors are a flat uniform color, not so much when the colors are mixed because it blends in.

What might be the problem and is there anything I can do to fix it?

thank you