Did you do use screen protector &or tempered glass.
Most probably something stuck between the screen & screen protector.
Remove all the screen protector & tempered glass, to see if the problem go away. If it go away, then you know the answer.
If no screen protector &or tempered glass, then you need to polish the screen surface.
Do note use those wipes for phones, and soft cloth(to clean spectacles).
Some phone screen surface is very sensitive.