blue line on screen

[tony4320]

hi all I have a Samsung j4 plus around 4 months ago i tapped the screen too hard and ever since there has been a blue line on the screen you can only see it on a white background if dark mode is on you can't see it any ideas on how to get rid of this line 

[Pugs1957]

Sounds like physical damage to the screen. If it's that bad or deteriorates, it will need replacement.