Weird distortion marks on iPhone 11
These marks have been spreading and disappearing time to time, it’s gets bad but I can still use everything. It covers the battery, that’s really the main problem.
iPhone 11, iOS 18
If it is showing everywhere, then as I said earlier, it would appear to be a hardware issue. I suggest you make a Genius Bar appointment at your nearest Apple Store to have the hardware examined. They will explain your options. Genius Bar Reservation and Apple Support Options - Apple