About 4 Months Ago I Was Playing Basketball In An

About 4 months ago I was playing basketball in an indoor gym, when I fell pretty hard on my right knee. Immediately, it felt more like a floor burn more than a bruise, but About a day after that, the right below the kneecap had a bright blue and purple and parts of green, a bruise, but it didn't hurt at all. Actually, I didn't feel anything at all. It was completely numb. I was able to walk perfectly fine and run and attend my practices.
After practices the numbness worried me and I kept icing it and applying a gel form of arnica. However, even now, after 4 months from that incident, about 5 inches of the diameter of the outside of my right leg, exactly the size of my bruise on the exact spot, is still numb just as it was 4 months ago. Is there a way to fix this? And what is going on?