iPhone XR Pixel

[Lekiamix]

I noticed something on my iPhone if I put my phone on dark mode it will show a little weird colour but if on white mode it won’t will it spread or go away

 

[BugeyeSTI]

I noticed something on my iPhone if I put my phone on dark mode it will show a little weird colour but if on white mode it won’t will it spread or go away

Without pictures there's not much anyone can offer as an opinion