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November 2005 in “The journal of investigative dermatology. Symposium proceedings/The Journal of investigative dermatology symposium proceedings” The lipid in human hair follicles acts as a barrier, similar to the skin's lipid layer.
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June 1998 in “Journal of Forestry Research” Mammalian hair scales change from smooth to wavy due to friction.
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September 2003 in “Archives of dermatology” Tiger tail bands in hair are caused by wavy hair fibers with melanin, unlike straight fibers in normal hair.
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February 1990 in “Journal of The American Academy of Dermatology” A 17-year-old developed woolly hair nevus in adolescence, which is unusual, and over time the hair darkened and straightened slightly, but microscopic changes persisted.
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April 1982 in “Genetics Research” Mice with the naked gene have missing or abnormal hair cells.
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December 2009 in “Journal of the American Academy of Dermatology” Improper use of ceramic flat irons can cause severe hair damage.
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February 1987 in “Journal of the American Academy of Dermatology” The hair cuticle acts as a barrier against fungal infection, which occurs only deep within the hair follicle.
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February 2016 in “American Journal of Dermatopathology” The boy with woolly hair nevus had thinner hair and abnormal hair follicles, which improved with treatment but worsened when treatment stopped.
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January 1998 in “Genes & Development” Hoxc13 gene is essential for hair, nail, and papilla development.
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November 2016 in “The Journal of Dermatology” Pili torti hair is fragile due to loose keratin filaments and weak disulfide bonds.
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July 2000 in “PubMed” Hair has unevenly distributed proteins and lipids, with lipids mainly in the cuticle and proteins in the cortex and medulla.
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July 2015 in “Journal of Medical Genetics” A genetic variant in the KRT25 gene causes tightly curled hair.