Due to aging, and especially after pregnancies or large weight loss, the abdominal muscles weaken and skin in the area becomes flaccid. Abdominoplasty is a surgical operation for tightening the abdominal muscles and improving stretch marks. In both men and women, the procedure will remove excess skin and fat. Generally, an incision is made across the pubic area and around the navel so that the scars will be easily concealed. The operation takes normally a few hours, and it is accomplished under general anesthesia.