The term gynecomastia indicates an overdevelopment in the breasts of men caused by an excessive development of the mammary glands (called true gynecomastia) or by an excess of adipose tissue (also called pseudo gynecomastia, false gynecomastia or lipomastia).

Gynecomastia can be classified into 3 degrees, defined according to the volume of the mammary gland and excess skin and can occur in one or both breast. To make a correct diagnosis of gynecomastia, it is necessary to undergo an ultrasound or mammogram examination to check the development of the gland. Most of the treated cases present a mixed gynecomastia, that is, with the presence of fat and the mammary gland.