For the last year or so, I have had an area of bruising just above ankle area on each leg that won't go away. No past problems. What could this be?

At your age... It could be a venous problem that is allowing blood to leak out of some of the small veins. The blood products are reabsorbed by your body but the pigment gets left behind. It's possible that this is the problem. Ask your family doctor to have a look the next time you go in.