Chosen Solution
I’m just a little pressure on my Lumia 640xl left corner, and after a while I did, I saw something like that there is at following picture accordingly, whether it can be repaired and how?
You would need to disassemble and reasseble the display and ensure the LCD is seated properly, or that no parts/screws are loose in the area to cause pressure from behind. This may have also been caused from heat applied during the repair procedure, so it may not be pressure.
