February 2021 in “PubMed” A 2-year-old girl had a hair disorder not shared by her identical twin.
March 1983 in “The Journal of the American Dental Association”
3 citations
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October 1990 in “Journal of the American Academy of Dermatology” Mechanical trauma like towel drying can cause knotted hair even in straight hair.
December 2025 in “Ethnologia Fennica” December 2022 in “Biochemical and Biophysical Research Communications” HtrA2 activity is crucial for normal hair growth by regulating fat cell development.
January 2012 in “International Journal of Trichology” Two siblings have a rare genetic condition causing curly, coarse hair.
4 citations
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January 2017 in “Annals of Dermatology” Frequent hairdryer use may worsen hair fragility in people with Pili Annulati.
1 citations
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May 2003 in “Archives of Pathology & Laboratory Medicine” The boy had trichotillomania, causing hair loss, and treatment focused on habit reversal and support.
July 2025 in “Dermatology Practical & Conceptual” A 2-year-old boy has a rare hair disorder causing brittle hair and hair loss, which may improve with age.
4 citations
,
November 1999 in “PubMed” Monilethrix is a rare hair disorder causing beaded, fragile hair, often improving on its own over time.
March 1990 in “Journal of Dermatological Science” 119 citations
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November 2016 in “American journal of human genetics” Mutations in three genes cause Uncombable Hair Syndrome, leading to frizzy hair that can't be combed flat.
January 2023 in “Indian Dermatology Online Journal” Uncombable hair syndrome is linked to Zellweger syndrome.
A runner developed tangled armpit hairs from shirt friction, preventable by shaving or wearing smooth shirts.
15 citations
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August 2015 in “Scanning” Corkscrew and cigarette-ash-shaped hairs in tinea capitis are caused by internal hair degradation and external resistance.
December 2004 in “Differentiation” June 2023 in “Zenodo (CERN European Organization for Nuclear Research)”
January 2007 in “Revista del Centro Dermatológico Pascua” A 2-year-old boy was diagnosed with a rare genetic condition causing fragile hair, intellectual issues, and short stature.
58 citations
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November 1969 in “British Journal of Dermatology” Netherton's disease causes multiple hair defects.
42 citations
,
September 1985 in “British Journal of Dermatology” Trichothiodystrophy causes abnormal protein deposits and distortion in hair follicles.
2 citations
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January 1987 in “PubMed” Woolly hair syndrome is a genetic condition causing frizzy, fragile hair.
September 2016 in “Journal of dermatological science” TSC2 is crucial for proper hair follicle development and patterning.
101 citations
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July 1985 in “Journal of the American Academy of Dermatology” Biotin improved hair growth and combability in one child with uncombable hair syndrome.
November 2023 in “Jurnal Ilmu Kesehatan Hewan” The dog's condition improved after 21 days of treatment.
January 2023 in “Skin appendage disorders” Two Hispanic women developed Plica neuropathica, a condition causing tangled hair, possibly due to hair damage and various risk factors.
January 2021 in “Thieme Medical and Scientific Publishers Private Limited eBooks” March 2025 in “International Journal of Trichology” Trichodaganomania involves biting one's hair and needs combined psychological and medical treatment.
16 citations
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October 1992 in “Journal of cutaneous pathology” Bubble hair deformity may be caused by hair shaft trauma and can improve with gentle hair care.