bubble in the actual screen of my galaxy s4

[ASMR__]

I have a galaxy s4 and I dropped it a long time ago and when it dropped their was this wierd bubble type thing in the actual screen it self and I just don't know what it is and best buy only told me it shouldn't me there. PLZ help.

 

[Titillating]

The screen probably came loose when you dropped it, forming an air bubble underneath. You should bring it to a repair shop to assess the damage.