I have a small discharge of blood seeping from my left breast only. This happens once or twice a month for the past four months. I have no pain or discomfort. I have had a mammogram three months ago, no mass was found. My doctor thinks I need to have a duct biopsy. I have an appointment with a surgeon next month. I would like some more information about this problem. Does this happen offen with women over 70 years of age or at any age?