Eager to resurrect her failed marriage, Mercedes dreamed of having a shapely rear end. A risky, potentially deadly, silicone injection technique beckoned. She said yes. Now she rues that day. "It hurts so much I cannot sit down for even five minutes," said the 45-year-old, her voice quivering. She is so embarrassed she won't give her last name. Thus goes body worship in Venezuela, where undergoing plastic surgery is as common as going to the dentist and beauty pageants are like a religion. Two years ago Mercedes underwent a procedure that has killed 15 people in Venezuela since 2011. It...