Chosen Solution

My Mobile f11pro . The display was a bit loose a while ago.there are no cracks or damages on the screen.I gave my phone to a repair shop so they can apply glue and fix the loose screen but ever since that this black spot appeared on my screen. Was it caused because of glue getting between the screen or is it some other reason? my phone was not dropped down or hit anywhere as well. please help

Could be glue or could be dust or a moisture spot. Unfortunately you’re stuck with it unless you’re willing to open the phone or have the shop look at it which will cost money. Any pictures?