Relating to or affecting a follicle, which is a small sac or cavity in the body, especially in skin, hair, or glands.
From Late Latin 'follicularis,' derived from 'folliculus' (small bag or sac), a diminutive of 'follis' (bag). The medical term entered English in the 18th century.
Your hair follicles are literally tiny bags that your body treats like separate factories—each one independently manages growing hair, producing oils, and deciding when to go into hibernation, which is why you can have different hair growing at different rates all over your head.
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