Not here, you might have a dead pixel. You can try playing a video on your phone, something colorful with fast movements, it might wake it up. If not, then it might be permanent.
As above, it sounds like a dead pixel. Can you take a screenshot? If it doesn't show on the screenshot, it confirms it's a hardware issue as opposed to software.
There's a free app called Dead Pixel Detect and Fix on Google Play. It cycles through many colours quickly to try and wake up dead pixels. Worth a shot before you think about replacing your phone.
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