Female, 50 years old, 5 1 , 125lbs. Acquired a serious bruise on her upper arm during a camping trip, healed at what seemed to be a normal rate, approx 10 days. About a month and a week later the bruise returned as a dark splotch in the shape of the original bruise. Google has done us no good, adding fear to simple confusion. What could be the possible cause of a returned bruise where no additional significant damage has been done?