Gynecomastia is a condition where the breast tissue in men enlarges on one or both sides of the chest. It can be transient (such as in puberty) or permanent. In cases where it does not resolve, it can be due to obesity, medications (such as steroids), hormonal imbalances, or genetics. Some basic medical tests, such as a blood test and ultrasound, will be done to evaluate the cause and ensure the breast tissue is normal. A male breast reduction will define and sculpt a flatter chest, elevating confidence and creating a more masculine appearance.