Accessory breast

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What Wikipedia says

Accessory breasts, also known as polymastia, supernumerary breasts, or mammae erraticae, is the atavistic condition of having an additional breast. These extra breasts may appear with or without nipples or areolae.

Excerpt from the Wikipedia article “Accessory breast”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: https://wellcomeimages.org/indexplus/obf_images/13/b0/78b457bcc81bb30132fa0eccedfb.jpg Gallery: https://wellcomeimages.org/indexplus/image/L0027954.html Wellcome Collection gallery (2018-04-01): https://wellcomecollection.org/works/sxseejyc CC-BY-4.0, CC BY 4.0, via Wikimedia Commons.