I have an old injury that happened about 40 years ago. I hit the upper part of my chick bone with the corner of a car door. I had a blackeye and it went away. At around age 40 my injury turned into a little swollen dark area and now at age 62 a little raised red spot (like a pimple with no head) has come up right on top of it. It doesn't hurt and it hasn't gotten bigger. What could that be?