Sagging arm skin can be caused by a number of factors, including age, heredity, and significant weight changes. This sagging typically cannot be tightened with diet and exercise alone. An upper arm lift, also known as brachioplasty, can eliminate excess fat and skin from under the arms. “Bat wings,” or excess skin hanging from the arms, can be eliminated with this surgery. With an arm lift Los Angeles plastic surgeon Dr. Christie can help you feel confident baring your arms again.