The raised edge around the screen makes room for the infrared touchscreen around the inner edge of the bezel. Because the IR filter is so dark, it makes light colored debris more visible. I have some white particles trapped between my screen and IR sensor too, and it is much more visible than trapped junk is on other kindle models. It does not wipe out either, and trying to pick it out would probably push it in farther. Just part of the "kindle touch user experience"...
