Leaving the implant sacs do not cause cancer by themselves but prevent early detection of cancer if it develops. I would have liked to know your age, the number of children you have, if you have breast fed any of them, and if you have any family history of breast or ovary cancer. Either way, any nipple discharge
needs to be investigated, although the history that you give is more in favour of an infection rather than cancer. To be certain, i would advise you to get a Magnetic Resonance Imaging
(MRI) of both breast, alongwith cytology testing of the discharge (the lab guy will take your discharge on a glass slide and examine it under a microscope). If both these tests are normal, then you have nothing to worry about. Meanwhile, start taking Tab. Ciprofloxacin
500mg twice daily + Tab. Paracetamol
650mg thrice daily + Tab Ranitidine
150mg Twice daily for 7 days.