RogPhone 2 Black Spot on the screen as if color is faded please help identifying the issue

Can anyone please help me out identifying this issue I am facing a black spot type thing when my screen is off while there is nothing when the screen is ON
It's like the color of the black screen glass has faded from the inside or what i don't understand
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Same has happened for zenfone 5Z to me ?
Have you visited service center regarding this ?
If you are using tampered glass then remove it. In my previous phone because of pubg there is spots at control area.
I have also same not this much bigger but same in fire button area... So i put screenguard nnow.now it will not show but still in screen... I don't know it will effect my gameplay because firebutton dragging side this issue.... Anybody know it will effect my phone my gameplay??...
So now what's the solution for this problem ? Does the glass get repairs by itself ?
A gaming phone shouldn't have such a problem don't you think. It has a gorilla glass 6 protection in it and still it's giving such a problem what the point of having this much protection
This is for your local ASUS Service Center to determine