Good Evening, I Fell The Other Day Pretty Hard Bring

Good evening, i fell the other day pretty hard bring 350lbs down on my knee. It was painful for about 15 minutes then just was stiff and a little pain. I have a little pain but i can feel an indent on the knee cap and it is sensative to touch but bearable. The fall took place on Tuesday it is now Thursday and pain level is the same when touched and the indent is still there. I don't like to go to drs unless neccesary. What could this be and do i need medical attention to prevent further injury or will it possibly heal on its own?