It sounds like you have a case of **screen burn-in**, which is a permanent discoloration of a display caused by the regular use of certain pixels more than others. It can happen to LCD screens as well as OLED screens, although it is more common with OLEDs. Screen burn-in can be caused by displaying static images for a long time, such as navigation buttons, notification bars, or always-on displays.

There are some possible ways to fix or prevent screen burn-in, such as:

- Turning down the brightness and contrast of your screen.
- Enabling pixel-shift or screen shift features that constantly move the image slightly to vary pixel usage.
- Playing a colorful video with lots of color changes for a few minutes to half an hour.
- Using gesture navigation instead of buttons, if your device supports it.
- Turning off your display for at least a few hours, or as many as 48, ideally.
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