Nyx that is water in between your screen. It may get better as it evaporates but you will most likely always have some stains showing up.
The other problem you may run into is corrosion failure of your phone if you do not take care of the water damage. The very first step I would take is to disassemble your phone. Use something like this video to help you disassemble your phone. Take a careful and close look at all components and connectors. Truly assess the damage. Look for major corrosion, evaluate the pins in the connectors etc,. Take a look at all connectors as well as cable ends. You will have to remove all the EMI shields. If you do not remove the shields, you are not cleaning the board. Once you got the gross contamination cleaned, use 90%+ isopropyl alcohol and clean your parts some more. For a proper cleaning, use this guide. It was written for an Apple iPhone 3G but it is still pertinent to your phone as well. I can not stress the importance of a good cleaning enough, so do it over and over while replacing the alcohol after each cleaning. Do not use compressed air for the cleaning since that can drive liquid as well as corrosion particles into areas that will cause trouble later on. Do not use drinking water, if you need to use water, use sterile water. Also, you do not need to leave it to dry for a day. Isopropyl alcohol in the higher concentration will evaporate quickly and dissipate the water. The importance here is the cleaning. It would of course be best to get it professionally cleaned Do not forget to replace the battery. This is a must and not an option. It will fail if you do not take care of it now. After that, reassemble your phone and re-evaluate. It is possible that you have a bad LCD and replacing the display assembly may fix it.
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Nyx any chance you could post a couple of pictures showing what it looks like? Bilder zu einer vorhandenen Frage hinzufügen
@oldturkey03 the second image shows what is is after just turning my screen on and tge first one happens after it was on a while.