[GameMaster]

http://ds.ign.com/articles/568/568084p1.html

"With a small number of Nintendo DS screens, one or two dots on the screen may appear to be "stuck" on a particular color, such as white or red. This effect is caused when a particular pixel (the dots that make up the screen) is not working properly, even with the high quality standards set by LCD manufacturers. You will find this situation is common in many LCD devices, (PC monitors, televisions, cell phones, etc.).

It's important to understand that this issue will remain limited to the pixels you have already noticed. The problem will not get any worse and you should not expect to see the problem in any other areas of the screen.

We suggest that you use your system for a few weeks to determine whether this interferes with your enjoyment of game play. If, after using your system for awhile, you feel that this tiny dot is too distracting, the Nintendo DS does carry a one-year warranty. We are happy to inspect and, if necessary, fix your system at no charge within the warranty period."

I have a dead pixel colored red. It seems to disappear sometimes though. Maybe I'll send mine in for a free fix.