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Mammary duct ectasia often doesn't cause any signs or symptoms. If you do experience signs and symptoms, you may notice:

  • A dirty white, greenish or black nipple discharge from one or both nipples
  • Tenderness in the nipple or surrounding breast tissue
  • Redness of the nipple and sometimes the surrounding area
  • A breast lump or thickening near the clogged duct
  • A nipple that's turned inward (inverted)

A bacterial infection called mastitis also may develop in the affected milk duct, causing breast tenderness, inflammation in the area around the nipple (areola) and fever. Signs and symptoms of mammary duct ectasia may improve on their own.

When to see a doctor

Make an appointment with your doctor for evaluation if you notice changes in your breasts — such as a new breast lump, spontaneous nipple discharge or an inverted nipple — that are persistent or that worry you.

May 01, 2015

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