Some male teenagers experience breast enlargement. Most of those will return to normal in three years or less. But some may not.
Body builders and athletes who take anabolic steroids may increase muscle mass at the risk of enlarging their breasts - a common side effect.
Similarly, as men age their breasts can become flabby, fatty or pronounced, even if they are otherwise in good shape.
Liposculpture using small cannulas removes unwanted fat from the breast area and restores a normal appearance.