20/20: Medical Mysteries/Hollywood High

In the first hour, Medical Mysteries reports on Vitiligo, a disease where the color of your skin changes; Trichotilomania, a disease where you uncontrollably pull out your hair; a man who was born with no arms and no legs; a transgendered man who is pregnant; and a look at some children who knew they were gay at a very young age. In the second hour, "Hollywood High" looks at drug and alcohol addiction in Hollywood, including what the causes and the consequences are.