I fell 10 days ago on my knee and leg. I can walk without pain in either my leg, knee or ankle. A very large bruise showed up 2 days later on the knee and the back of my leg behind the knee. Today the ankle on the same leg has started to bruise. Is it normal for bruising to appear so many days after the original injury? There is no heat at the site of the bruising and pain only when I push on the bruise.