About a month ago, I banged my knee on the cement/concrete (not sure which one) floor. It didn't bruise, it didn't hurt anymore a day or two after it happened. I thought it went back to normal, but no. A week after that experience, I then started feeling sharp pains on the side of my knee when I went to kneel down on the floor, or even my bed which has a very soft mattress. It also started hurting to the touch, but not as bad as kneeling on my mattress or floor. There was still no bruise. It's been a month now and it feels the exact same... Still no bruise. I'm starting to question if I should see a doctor.