What Causes Swelling And Bruises At The Foot And Ankle After A Hit At The Knee?

I fell a week and a half ago. Banged my knee and upper chin area pretty good. I had swelling that looked like a baseball on the side of my knee that evening. I applied ice packs, the swellling went down for the most part. It was never sore enough to cause too much limping. The next afternoon, the inside calf area was a bit swollen and tight but did not hurt at all. By the weekend, swelling was down, brusing visable. The problem is that now I have swelling in my foot, first the outside, now the inside at ankle area with brusing. This morning I noticed a place on my shin starting to turn red. Other than tenderness like a mild bruise, non has really hurt - what is causing this?
I am 50 yrs old, about 240 lbs.