Shadows in left corner and left part of screen Imac i5

Hello,
I have been observing a  shade-smudge in the  lower left corner of my screen and a vertical shade-smudge as one can see in picture of my screen on white textedit. Unforutnately i do not remember or i have not observed it when i first bought my Imac. When i tried to get a screenshot with Grab it was not there. However it shows when you take a picture from a mobile, so that makes me think it must be either the glass or the panel . Any thoughts?

It can be normal for the screen to look garbled just after you wake your MBP from sleep - but it should return to normal within a second or two, not stay that way for much longer. If it does, you may have bad video RAM, or a faulty cable leading to the display panel.
I'd run Apple Hardware Test to check the video RAM. If it doesn't find anything wrong, I'd still have it looked at, since certain types of defects (for example, a bad display data cable) cannot be detected by AHT.

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