Faint white smudge on screen, only shows against white backgrounds
My MBA has a small white bright spot on the screen, which only shows up on white backgrounds and disappears completely on black or mixed backgrounds. It cannot be a dead pixel as it is more diffused in appearance and isn't always on or off. I would be very grateful if anyone has any experience with this problem, in particular:
1. Are there any fixes for this that doesn't involve sending it into Apple?
2. Is covered under an Apple warranty?
Many thanks!
Macbook Air 13" (2010), Mac OS X (10.6.6)