May be appropriate if you have loose or hanging skin and excess fat in the upper arms despite toning exercises, or if you have lost a significant amount of weight. Arm lift is done using double ellipse technique, which will camouflage the scar. If skin tone is good, liposuction alone may reshape the arm by removing excess fat.
Dr. Soliman has a publication about the double ellipse technique in arm lift: Brachioplasty in the Massive Weight loss Patient. Clinics in Plastic Surgery, Number one, vol. 35; 141-149 January 2008.