Huawei P20 lite, yellow line in the display?

Have since yesterday a Huawei P20 Lite and just noticed that has formed on the outermost display edge on the right side of a yellow line. What is this I mean now and my question now is: does a burn-in continue to spread across the screen or does it remain forever as it is now? Hope you understand what I mean. Just fear that the burn-in over time spread over the entire display.

Can certainly happen.

But is also a warranty case and you can - if there's still warranty on your device, repaired.