Thank you for your question about getting a mini arm lift after losing 100 lbs. Congratulations on your weight loss! You can undergo a mini arm lift. A mini arm lift is also called a crescent arm lift. During a crescent or a mini arm lift, a crescent area of skin is removed from the armpit region. This tightens the arm and allows for the scar to be moderately hidden. It gives a mild to modest at best arm lift. It removes approximately 2-6 centimeters of skin in the axilla. Another modality could be VASER Hi-Def liposuction. Using this technique, fat can be withdrawn. The VASER would be optimal because it would help the skin to retract. Given your age and your pictures,, this arm could respond well to VASER liposuction and avoid the need for arm scars altogether. Therefore, I would suggest you consider VASER Hi-Def liposuction before considering a mini lift. I specialize in arm lifts. I hope that I have answered your questions regarding the arm reduction. If you have any more questions regarding the arm lift, arm reduction, brachioplasty or arm crease fat grafting, please contact my office. Since a brachioplasty or arm lift surgery is a difficult procedure, please seek an experienced, board certified plastic surgeon with significant experience performing these types of arm lifts. Do your research. Make sure your chosen plastic surgeon has performed at least 100 arm lifts. 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. (“Verified” 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.)