Episode Detail: Medical Mysteries - 20/20
Unusual medical conditions are examined. Included: trichotillomania (a compulsion to pull one's own hair); ectodermal dysplasia (a skin disorder characterized by a lack of sweat glands and fingerprints); selective mutism (a social anxiety disorder resulting in an inability to speak in certain circumstances); and a syndrome in which people who have it hear sounds their bodies are making, including noises resulting from chewing and blinking.
