Inverted nipples are a common phenomenon experienced by both males and females. The medical term used to describe this condition is "nipple inversion," and it is often caused by inherited genes or medical conditions. A few other synonyms for the term inverted nipple are retracted nipple, sunken nipple, and depressed nipple. If you experience inverted nipples, it is essential to determine the cause to know whether it requires medical attention or not. Although some level of nipple inversion is normal, it's always best to consult with a healthcare professional if you notice any significant changes in your nipple appearance or feel any pain, discomfort, or discharge.