Biceps. Triceps. Glutes. Quads. Calves. Abs. Your workouts are paying off. Your body has never looked better, and you can’t wait to show it off in your new summer wardrobe. But what’s with the stubborn double chin that’s haunting your selfies? Why won’t it go away? We understand your frustration. So do 68% of people surveyed by the American Society for Dermatologic Surgery in 2014 who named excess fat under the chin and neck as one of their top concerns. That darn double chin is just ..