Hi Fabulous682377, . Thank you for your question regarding what this crease in my upper arm is and how it can be fixed. Thank you for your history and your pictures. First, we should analyze your pictures to determine the best procedures. According to your pictures, you have cutis plica (excess skin) and dermatochalasis (loose skin) without stretch marks (striae). Furthermore, you have arm lipodystrophy (excess fat). Your loose skin, excess skin, and fat are located in the proximal or inner third of the upper arm. Since you did not have this condition until you were 15/16, this is not a congenital band. Most plastic surgeons would agree that this area appears this way due to the excess skin and fat in the upper inner portion of your arm. Because you have a significant amount of excess skin on your arms, liposuction alone is unlikely to provide the best result. In addition to removing fat, surgical removal of the proximal excess arm skin is recommended. There are several types of arm lift (brachioplasty) procedures, and the most appropriate option depends on the amount and location of the excess skin. The main types include crescent (mini) brachioplasty, modified longitudinal brachioplasty, T-incision brachioplasty, longitudinal brachioplasty with the scar placed in the bicipital groove (the inner arm between the biceps and triceps), longitudinal brachioplasty with the scar placed along the back of the arm (over the triceps area), and an extended upper and lower brachioplasty, in which the incision extends from the armpit down toward the wrist. You would do best with the modified longitudinal brachioplasty. During your arm surgery, upper arm liposuction would be performed. Then an incision would be made from the armpit to about 2 cm past your "arm crease/fold"; this surgical technique would eliminate this fold by removing the excess arm fat and skin around it. If you just excise the arm fold, you are still left with the proximal excess arm skin and fat. Therefore, you "need" the arm skin and fat removed, not just the arm crease. Since an arm lift can be a challenging surgery, please seek an experienced, board-certified plastic surgeon with significant experience performing these types of lifts. Do your research. Make sure they have performed at least 150 arm-lift procedures. Make sure they have the before-and-after pictures to prove it. Carefully examine their before-and-after pictures and check their reviews on RealSelf. Sincerely, Dr. Katzen, MD, MBA, FACS, FICS, FASMBS, FASBPS (Plastic Surgeon, President of the American Society of Bariatric Plastic Surgeons, certified by the American Board of Plastic Surgery, Fellow of the International Society of Aesthetic Plastic Surgery, American College of Surgery, International College of Surgery, and American Board of Metabolic and Bariatric Surgery, and member of the American Society of Plastic Surgery, American Academy of Cosmetic Surgery and RealSelf Hall of Fame.)