I fell just over two weeks ago and landed on both knees on concrete. It was hard enough to bloody my right knee through jeans. My left knee was more painful, but there were no marks. Within a few days, I noticed a large but very faint bruise just below the right knee. It is still a little tender, but not really painful. There is a light, crescent shaped bruise now. Today I noticed that there is a hard lump below the knee and toward the inside of the left leg. The whole area below the knee is numb. Should I be worried, or just take a Motrin and wait for it to go away?