Supernumerary nipples, also called accessory nipples or polythelia, are extra nipples that develop outside the normal breast area. These additional nipples can appear along a line extending from the armpit to the groin area, though most commonly they are located on the chest.
They are usually small, but some may have small mammary glands, while others may only have the nipple structure.
The presence of supernumerary nipples is a benign anatomical feature and is not associated with major health issues. However, it may cause physical discomfort for those affected. While they are not concerning, if they cause discomfort or are associated with other symptoms, a consultation with a cosmetic surgeon may be warranted.