Hi
For now it probably isn’t something to worry about as long at the display isn’t physically damaged (cracked glass,internal damage,chassis bends)
From what the photo shows it could just be a software issue (assuming it’s a screen shot rather than a photo taken from a separate camera)
If it is a screen shot you should try reseting the device (here’s a guide for that [link|https://support.apple.com/en-gb/HT201252|https://support.apple.com/en-gb/HT201252|new_window=true])or taking it to apple to see if it’s a software bug that they could fix in a future software update
Hopefully this helps
Any questions please ask
Thanks:-)