Your symptoms could indicate anything from bursitis in front of the knee to a torn cartilage inside the knee. Depending on how long youve had this problem, I would try ice for twenty minutes several times a day, avoid the activities that make it hurt, and judicious use of over the counter NSAID's if you are allowed to take them. If the pain persists for more than a week to ten days, or gets worse, then I would see an orthopedist for a full evaluation.
I had the knee pain on and off for about a year.The numbing feeling just started about three months ago.I will try the ice to see how that works out.Thanks