A congenital condition characterized by the absence or severe deficiency of hair growth on the scalp and body.
From Greek a- 'without' + thrix (trichos) 'hair' + -ia noun suffix. A medical term that emerged in the 19th century to describe hair loss conditions.
Atrichia is so rare that only a handful of people worldwide have it—when discovered, it helped scientists identify a specific gene involved in hair development, teaching us how hair follicles actually form.
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