What is BDD (Body Dysmorphic Disorder)? a psychological problem that involves obsessions, which are distressing thoughts that repeatedly intrude into a person's awareness. With BDD, the distressing thoughts are about perceived appearance flaws. People who suffered from BDD, often done an excessive grooming for their appearance, and an appearance perfectionist.
How does BDD related to cosmetic surgery? People who had done cosmetic appearance to fix their appearance, often times suffering from BDD. They never get satisfied with their appearance r being grateful, instead they're obsessed to fix the "imaginary flaws", even to the smallest unimportant flaw. They exaggerated for finding themselves looking way too hideous and search for the "perfect beauty", which the perception is relative. Some have done it through cosmetic surgery to change their appearance better. Alicia Douvall is one of the example, she is a model who grew up as a beautiful teenager, and suffered from BDD so badly, that she never get satisfied with her looks, even after she has done a plenty of cosmetic surgery.
"Body Dysmorphic Disorder." KidsHealth - the Web's Most Visited Site about Children's Health. Web. 18 Mar. 2011. <http://kidshealth.org/teen/your_mind/body_image/body_image_problem.html>.