blue screen mark - G Pad 8.3 Q&A, Help & Troubleshooting

Hello everyone after I installed LineageOS I've noticed a blue mark on my LG G pad screen, the mark is only noticeable in very dark / black images, haven't tried to go back to stock or different custom rom, did anyone face similar issue?
edit: the mark is about 1cm under and 1cm right the center of my screen.
I've searched the web and it might be a internal component pressing against the screen or a heat issue (my tablet never heated too much).
I can't print it and I'm not available to take a picture of it, a selfie cam mirror shot won't capture the mark.
Again, it's a dark fading blue, the mark is about 5mm wide.

Any help?

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Bump. Also, 10 characters.

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[img=http://s30.postimg.org/v7v763d99/20150923_155329.jpg]
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Hi!
I have received my Red Magic 8 Pro and immediately noticed something. The selfie camera is visible if the background behind it is simple. For example just a simple white or gray background. Depending on movie sometimes it also becomes visible under cartoons like Rick and Morty, however during normal movie I cant see it.
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