Gynecomastia surgery reduces breast size in men, flattening and enhancing the chest contours. In severe cases of gynecomastia, the weight of excess breast tissue may cause the breasts to sag and stretch the areola (the dark skin surrounding the nipple). In these cases the position and size of the areola can be surgically improved and excess skin may be reduced. Plastic surgery to correct gynecomastia is technically called reduction mammaplasty.