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Alopecia areata is an autoimmune disorder characterized by transient hair loss. Severity can range from distinct patches to total hair loss. In this Primer, the authors describe the underlying pathophysiology of this complex polygenic disease, as well as the epidemiology, diagnosis and management.
Psoriasis can have a profound impact on patients' emotional and social lives. Christopher Griffiths, a dermatologist at the University of Manchester in the United Kingdom, discusses the disease's psychological fallout and its links with stress.