Alliewinter, it's not dead pixels. Just a software glitch.
I used to get it earlier on my HD+ where some of the app icons on home screen would have glitchy pixels. Going to any other screen and those spots would be fine.
It's 99% a software error.
My HD+ screen is fine. This was 2 months ago or so. The screen is fine now and the glitchy pixel thing is gone too.
I think what has happened is that the software rendering of the image you chose for your lock screen is not right. So it's showing you some pixels wrong. That's all.
Well, hopefully, that's all.
From Wikipedia: a dead pixel never shows light, and a stuck pixel always shows light (typically red, blue or green), when the device is active.
So if the pixel is fine eveywhere else and only glitchy on lock screen, that 99% has to do with the software rendering of the image on your lock screen.