He specializes in breast and body contouring surgery, including the treatment of gynecomastia. Gynecomastia (enlarged male breasts and/or puffy male nipples) is exceedingly common, occurring in up to 30% of teen boys and 15% of male adults. Gynecomastia (gyne=female, mastia=breast) is often related to hormonal imbalances, but the cause is usually unclear. Less common causes of gynecomastia include liver disorders, chronic alcohol use, pituitary tumors, and certain medications.