Hi I ran into the corner of a wall with my knee , right on the center of my knee cap. This has happened to me before, it s been painful but the pain has gone away after a short while. This time around it was very painful lasted for a while and noticed it was pinkish and a little swollen, hurting when I began walking and going up the stairs also getting up when I m sitting. As the day has progressed it continues to hurt while doing the above and it has swelled more. What go u think this can mean? Thank u and I await ur response.