Thanks for your inquiry, but without a picture, and more importantly an exam, it is impossible to advise. You could just have a bruise,or something more serious--best to be seen in person by a doctor.
Hello, could be a few things... small skin capillaries that are ruptured, development of small capillaries due to recent trauma, old resolving blood, or other things... If you have any question or concern about your breast or breast implant it would best to seek out a board certified plastic surgeon who can evaluate your breast and make recommendations based on and examine and history. Good Luck.