[dewey]

Yep, that's the screen coating coming off. It's known as "Staingate": http://www.staingate.org/

I got mine replaced for free from Apple (they even upgraded me to the most expensive model of the next generation as they didn't have my medium level one any more)

[bpicolo]

Does it have to be under the first year or two for warranty for that? I definitely have this, but I'm 2.5 years out at this point.

Edit: https://9to5mac.com/2017/02/24/retina-macbook-display-staing... Oh my! I think I could go get a shiny fix/replacement. I am definitely going to have to do that

Thanks for this post! hah