Definitions for "Inverted nipple"
a nipple that retracts, rather than protrudes when the areola is compressed.
The turning inward of the nipple. Usually a congenital condition; but, if it occurs where it has not previously existed, it can be a sign of breast cancer.
The situation where the nipple of the breast sits lower than the surrounding areola. An inverted nipple may cause problems with breastfeeding. Piercing an inverted nipple was used in the 19th century as a treatment for inverted nipples. This does work, but at this stage I do not know whether the nipple remains in a normal position later on if the jewelry is removed. Read Anni's experience.