I fell over a week ago. Very black bruising immediately. Seems to look better but feel worse. Bruising is spreading daily? It is centered on my knee

A. A bruise is created when small blood vessels called capillaries break. Blood can escape from the damaged area and spreads into the tissue surrounding the capillaries. The more blood spreads, the larger the bruise appears. You will also notice that during the healing process the bruise will change colors. Because your pain is getting worse and not better with time, you may have more than just a bruise. I recommend that you have your knee evaluated by your doctor. Take care.