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I would think it is something hardware behind the screen at that point. Also how hard are you pressing on the screen?
 
if i press really hard the screen under my finger is also white on every part of screen.

This is medium press on any upper part of a screen.

If i use "normal" light press the mark is not shown.
 
I have to press pretty hard for something like that to show up. Same, light normal presses don't show anything but I've noticed if I press pretty hard (a lot harder than I ever normally would) stuff like this appears. <shrug>.
 
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Did you solve this? I had exactly the same but I've returned it. No idea what's the reason behind it.
 
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