Supernumerary nipple (note that the supernumerary nipple occurs in the "milk line").
Reproduced with permission from: The breast: Examination and lesions. In: Emans, Laufer, Goldstein's Pediatric and Adolescent Gynecology, 6
th ed, Emans SJ, Laufer MR (Ed), Lippincott Williams & Wilkins, Philadelphia 2012. Copyright © 2012 Lippincott Williams & Wilkins.
www.lww.com.