Hello,
This will be from the drop and the black would be the leaking of the LCD. To fix this you will need to get a new LCD because the LCD is damaged and you won't be able to fix it anyway else. You can find cheap LCDs from eh Motorola on eBay and high-quality ones on Ifixit. If you are doing this by yourself of course then follow the ifixit guides on replacing your screen.
Hope that helped