dark bruises on knees and legs

[Michele]

Hi

Has anyone ever experienced a series of dark bruises appearing on your knees and legs as a result of running? 
I have been running for 16 years and have never had bruises appear like that until now.  The bruises are dark, large spots and do not hurt. They just started appearing a couple of weeks ago and they have been increasing.  I have not hit my knees pr legs at anytime in the past few weeks.  Should I be worried? 

[Dallen]

Seems strange. I doubt that running caused the bruising. Maybe something else. Kneeling? Something else you did? If the problem lingers you might want to get yourself checked out.

[April G]

That is strange, and is something that could be a symptom of more serious underlying disease.  Anemia jumps to the top of my head.  You need to go see a doctor.