Learning to use a laser to reduce wrinkles is a huge shift in philosophy for Dr. Briana Spooner, a pediatrician. Dr. Spooner is taking classes to learn an additional trade. She is part of a growing trend of medical professionals moving outside their specialties and into the world of beauty. Despite a bad economy, the number of medical spas has grown 80 percent in the past two years, according to the International Medical Spa Association. This field— once dominated by plastic surgeons and dermatologists—is now expanding with family practice doctors, internal medicine specialists, and even dentists. The reason? Money.