Grey opaque smudge on iPad screen
My wife has a 12.9 inch iPad Pro 5th generation with a Logitech Combo case\keyboard on it. Over the last few weeks she has seen a grey smudge-like dot appear on the bottom center of the screen. I can make it go away or reappear by putting a little bit of pressure on the back area of the iPad where the dot is. I have tried another Logitech case of the same model but the problem remains. I am thinking either this is some odd hardware problem, or an even stranger problem with the case! She has been using the case for several months so I am not sure why this is happening right now. The smudge stays in the same place if the screen is rotated. Other than this glitch, her iPad is working perfectly! I am attaching a photo of the smudge to possible help you all determine what this is! Thank you in advance for any help you can give me!
Note: This photo shows vertical lines on the smudge which you do not see when looking directly at the iPad.
iPad, iOS 10