I have 2 fingerprint burn in marks from where I place my fingers playing ROS. I'm not using any screen protector. Anyone else see this happening on their phone?
You’re wearing out the oleophobic coating. I have a friend that did that with his HTC One in middle of screen where he swipes the most. Acidic sweat. Was the only phone it happened to him. He currently using S7 Edge and no issues
Install some screen protector, even if it's a little cheap $1 plastic one. Then when you wear the protector out you can replace it. (Replacing the glass on the screen is a lot more expensive.)
Just thought about it and wanted to add... Might as well contact Samsung support to replace screen... They might use lame excuse of being under 'normal wear' but it really isn't and hopefully they should help. You paid enough for flagship level support eh?