I just dropped my iPhone 6s Plus and now it has a little green splatter looking thing on it

I just dropped my phone about an hour ago but when I picked it up the green splatter, spot thing wasn't there but about 15mins later it showed up. Anyone know what wrong with it and should I be concerned?

PART FROM SCREEN WAS DAMAGED, SOONER THAT AREA SHALL NOT RESPOND AND EVEN EXPANDING SLOWLY.