Hello,
Most bloody or watery (serous) nipple discharge (approximately 90%) is due to a benign condition such as papilloma or infection. A papilloma is a non-cancerous, wart-like tumor with a branching or stalk that has grown inside the breast duct. Suspicious nipple discharge is due to a malignant (cancerous) lesion just ten percent (10%) of the time. Discharge caused by a malignant condition is almost always on one side only (unilateral). Please see your doctor for an evaluation.
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