What Causes Swelling And Bruising In Finger After Crush Injury?

I had a finger smash injury on thursday and was referend to the emergency department to have it drained. They made the hole and bandaged me up but overnight the swelling and bruising have increased. Is this normal and how long will it take to heal? I was told to go back if it filled up again and have the procedure repeated but how long should i wait before going back?ype your