2. Less Common Signs

In some cases of mammary duct ectasia, more severe symptoms occur, including redness of the nipple and surrounding tissue, an inverted nipple, or a lump in the breast that forms near the clogged duct. These lumps often consist of scar tissue around the affected duct. They can be quite hard and may be confused with breast cancer.

Other Signs Doctor monkeybusinessimages / Getty Images

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