Suggest Treatment For Swelling And Black Coloration On Foot Post Injury

Hello,
Three days ago a large table (about 50lbs) was dropped onto the top of my foot. I had an x-Ray done and the doctor said that while I did not break my foot, there was a possibility of other injuries. I am curious as to what these injuries could be. The top of my foot is black and blue and still swollen. Also, there appears to be somewhat of a "dent" in the top of my foot where the table fell. I have been following the RICE method but I was just curious about what the other injuries that the doctor mentioned could be.