Women are embracing with open arms the chance to look like Michelle Obama in a sleeveless dress. Upper-arm lift procedures have shot up 4,378 percent over the past decade, the American Society of Plastic Surgeons reported yesterday. Last year, 15,000 Americans — 98 percent of them women — had liposuction to get rid of excess fat, or a surgical procedure called brachioplasty to remove flabby, loose skin hanging from the back of the upper arms. In 2000, just over 300 had the procedures. The trend’s popularity is partly because people who have lost huge amounts of weight through diet and...