Aging skin bruising

It is not uncommon for a friend or relative to corner me with a worried look on his face and ask me about bruising on the arms or legs.  It is one of the more common concerns of patients in the office too.  People are worried that it is a harbinger of leukemia or some other blood disorder.  "Look at my skin.  These spots just appear for no reason.  What are they?"

What I'm seeing is the