Sagging of the abdomen can occur from age, pregnancy and cycles of weight gain and loss. Post-pregnancy abdominal changes are often due to the stretching of the skin. Sometimes time does not restore the abdominal skin to its previous position so we need to do something to strengthen or tighten this area. Ad Advanced Dermatology, we recommend either the TriPollar Appollo or Thermage. Both of these use radiofrequency technology to stimulate new collagen growth and firm the tissue to regain its lost shape.