Extra (supernumerary or accessory) nipples or breast tissue

Extra nipples or breast tissue is fairly common (1-6% of women) and is a result of incomplete regression of the mammary ridge (milk line) during the development of the embryo before birth.

Pseudomamma of the inguinal region in a female patient: A case report - ScienceDirect

Engorged Breasts - Breastfeeding Support

Third Nipple (Supernumerary Nipple): Causes, Types & Removal

Extra (supernumerary or accessory) nipples or breast tissue

If a girl has a third nipple, would it develop into a third breast

Supernumerary nipples–uropathies–Becker's nevus syndrome - Wikipedia

Supernumerary Nipple

Breast pain

Supernumerary nipple dermoscopy

If a girl has a third nipple, would it develop into a third breast

Third Nipple: Types, Causes, Removal, and More

Breast Lumps - Breastfeeding Support