apple watch screen

As the thread title, here's my S4 44mm in space black stainless steel Noticed tonight that the screen is lighter down the right hand side on grey backgrounds, which is most of the UI. Has anyone else had this and if so what was your experience if you raised this with Apple? Thanks in advance.

I wasn't doing anything but typing at work and it popped off. you can see the battery swelling so that was obviously the issue. I purchased this one when best buy was having the crazy sale on the SS models in late 2016. I bought one for me and my wife. i also purchased apple care+ which expired...