Gynecomastia is a medical condition of the body that causes the development of man boobs and puffy nipples on a male. Usually, gynecomastia occurs in older adult men because of an imbalance in hormone levels. But it can also occur in male babies and teenagers. While gynecomastia doesn't usually cause any serious health risks, it is often highly embarrassing, especially whenever a man has to be in a situation where his shirt has to be off. Other men and women...