question: About five years ago I got a bad blister on the back of my heal/foot. It scarred and was fine until about 4 months ago when I hit my foot on something rather hard. The scar bruised and was very painful, but it subsided after only a few days. Since then, on 3 different occasions, I have very lightly tapped my heal on something and the area instantly bruises and the tap feels like a very sharp pain. I had it xrayed and I m told it was clear. Any thoughts?