Weird pixel glitch(?)

[HNNNNNGHHH]

I've noticed an odd thing with my M8.

When I view anything with a dark enough color (black especially) within an app that doesn't use immersible mode, I've noticed a weird flicker of white with 5-4 pixels, the spot right by the very top edge of the navbar. It doesn't bother me since the issue is sporadic but should I be concerned?

By the way, these don't seem to be dead or stuck pixels as none of them show up as black regardless nor are any stuck showing white.

U WOT M8

 

[Rukbat]

They probably should be masked off by the black around the screen. You're probably seeing the end of the retrace, which would appear like a few "dancing" pixels on the top line.