When was the last time you had your platelets checked? Don't mean to scare you but (sorry) a girl at work was recently diag with a rare blood autoimmune disorder called TTP. Forgot what that stands for, and I don't know what her symptoms were. She will be okay though. Other symptoms besides the weird bruising include:
Paleness or jaundice (a yellowish color of the skin or whites of the eyes).
Fatigue (feeling very tired and weak).
A fast heart rate or shortness of breath.
Headache, speech changes, confusion, coma, stroke, or seizure.
A low amount of urine, or protein or blood in the urine.
(Yes i copied and pasted). It's probably nothing, like other posters have said, but I would definitely get this checked.