Green line only visible on whites and light colors

I bought a iPhone 11 and after 20 days i realized there was a dead pixel. The store I bought from replaced my phone with a new one. I've been using the new one since february and I realized I have a very thin green line on the left side of the screen and it's only visible on white and light color surfaces. It's not visible on dark colors like black etc. I updated my software but it's still there. Should I take my phone to Apple Genius? I still have the warranty.