I dropped my kindle

It survived, but there's a little cluster of grey pixels that won't change colour. I've reset the device to force a screen refresh, but they're still there...
I assume that this is just physical damage from the fall? Or is there anything else I can try?
It's not too bad, because it's in the margin rather than the middle of the screen. But it berates me with my carelessness every time i see it...