Is it anything like 'screen burn', pixel death, light leakage, something that's worked its way there from inside or outside your phone, like moisture, or something else that's permanently there? If it is, then you probably need to send it in to get fixed.
What I've sometimes seen on my phone is a dark background/page/section that isn't properly refreshed, so you see the 'ghost' of a word or icon, etc, that was there. These always go when the background/page is refreshed properly or overlaid. It's a quirk of the Android OS and coding rather than any fault with the display or screen.
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