The psyche and the skin.
The concept of psychosomatic disorders has been undergoing great evolutionary changes during the past 20 to 30 years. There is no longer any significant or reasonable disagreement that the brain and body mutually interact, and the pathways of those interactions are being explored and explained. Enormous amounts of work are being done to unravel the workings of the brain, which is more complex than any other organ because of neural connections and networking of astronomic proportions.
Masters
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D005162:Factitious Disorders / Q000175:diagnosis; D006801:Humans; D011602:Psychophysiologic Disorders / Q000175:diagnosis*; D012871:Skin Diseases / Q000175:diagnosis*; D013315:Stress, Psychological / Q000150:complications