I was long boarding down a hill and soon got a bad speed wobble at about 20mph. I flipped off my board and slid/ rolled down the remainder of the hill. I got scraped up slightly on my right knee and elbow, but my left knee concerns me most. I have a huge scabbed up scrape covering the right side of my kneecap, and bruising along the right side of my left leg. My main concern is that there is numbness underneath my patella (under the actual scrape) that is almost seemingly puffed up. There is little swelling, but none the less, some. I am 100% sure nothing is infected, but there is also considerable pain when running and a bit when walking.