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The Doctors explain that mastitis is an infection of the breast tissue that can cause swelling, tenderness, and redness. They say this most commonly occurs in women who are breastfeeding and can be caused by backed up milk or from a bacterial infection.
On her web series "Momsplaining," the actress says she had Dax "nurse out" the clogged duct.
OB/GYN Dr. Nita Landry says the recommended way to deal with mastitis is to empty the breast frequently, either through breastfeeding, with a breast pump, or hand expression. She says if an infection occurs that antibiotics can be used to treat any infections. Dr. Nita notes that she does not sign off on Kristen and Dax's approach to dealing with mastitis.