White/pink line suddenly appears on screen

[Gillani]

Suddenly pink line appear 

[Mujibar]

Pink, green, or white lines suddenly appearing on your screen indicate an issue with the display hardware. You should take your phone to a service center for evaluation. Here's how to find one:

https://www.samsung.com/us/support/service/locations/


See this article for more information about this phenomenon:

https://www.androidauthority.com/how-to-fix-green-line-issue-on-phone-screen-3342058/