A medical condition involving the loss or absence of hair, particularly on the scalp and body.
From Greek a- 'without' + thrix (trichos) 'hair' + -osis noun suffix indicating a pathological condition. A synonym for certain forms of alopecia.
Atrichosis can be congenital (you're born with it) or acquired (it develops later)—understanding the difference helps dermatologists decide whether to focus on genetic counseling or treating the underlying cause like nutritional deficiency.
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