I mac retina display
2015 iMac has got pink edges all way round the screen.
iMac 21.5", macOS 10.15
In the grand scheme of things, that is still a very small amount of users. Millions of these machines were sold and if it was a wide spread issue Apple would have addressed it with a service program. Sorry you are experiencing the issue, however as directed you should take it to your local AASP to be professionally diagnosed.
