I have a very tiny, fuzzy black speck on the screen of my Macbook Pro 15".

I have a very tiny, fuzzy black speck on the screen of my Macbook Pro 15". It doesn't resemble dead pixels I've encountered in the past (it is only visible behind a white or brightly colored background), and I'm positive it isn't sitting on the surface. The computer is only a year and a half old and my software is up to date.