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You could be having ductal ectasia which is a common cause of nipple discharge
. Do you breast feed. Any pain or lump in the breast
. It would be best to consult a Surgeon to examine you for the various causes of this problem and offer you proper solution. If it is just duct ectasia you may require an antibiotic course which should work in eradicating the infection, if not working then a small surgery to remove the affected duct would suffice.