Hi. I was on my pontoon boat. The door was stuck. I pulled hard, it rammed into the side of my knee. I immediately had a reaction, where it swelled up on the inner side of my knee where the door rammed into it. It stayed swelled to the size of a baseball. I iced it for the evening, and now 2 days later it s still warm to the touch, and swollen, somewhat sore. Swollen about 1/5 of what it was 2 days ago. However, it is still warm to the touch and sore.