September 2023 in “International Journal of Trichology” A rare hair regrowth pattern can occur in some people with alopecia areata.
April 2023 in “The journal of investigative dermatology/Journal of investigative dermatology” Developing hair follicles form from ring-shaped patterns, with future stem cells originating from the outer ring, not the upper layers, as previously thought.
April 2016 in “Actas Dermo-Sifiliográficas” The document concludes that a unique target-like hair regrowth pattern in alopecia areata may be more common than thought and should be properly identified.
4 citations
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April 2016 in “Plastic and reconstructive surgery. Global open” Scalp medical tattooing effectively camouflages bifid parietal whorls.
8 citations
,
January 2020 in “International Journal of Trichology” Different patterns on the scalp help diagnose types of hair loss without needing a biopsy.
1 citations
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January 2018 in “Journal of Cosmetics Dermatological Sciences and Applications” A targetoid hair regrowth pattern indicates recovery in alopecia areata.
14 citations
,
May 2014 in “Archives of plastic surgery” The position of the parietal whorl can predict safe donor areas for hair transplants in Korean men with male pattern baldness.
90 citations
,
January 1999 in “Journal of The American Academy of Dermatology” "Christmas tree" pattern helps diagnose female hair loss.
December 2025 in “International Journal of Advanced Biochemistry Research” Malvi cattle hair varies in color and pattern across different body regions.
55 citations
,
February 2014 in “Journal of Structural Biology” Human hair has a complex, variable structure with a consistent matrix and double-twist pattern.
March 2021 in “CRC Press eBooks” The document concludes that different patterns of hair thickness and scalp changes can help diagnose types of non-scarring hair loss.
85 citations
,
October 2007 in “International Journal of Dermatology” Curly hair shape is due to uneven growth patterns in the hair follicle.
2 citations
,
May 2020 in “Journal of the American Academy of Dermatology” Hair shaft changes may be linked to CCCA, but their role is unclear.
8 citations
,
October 2024 in “Developmental Cell” 2 citations
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February 2021 in “FEBS open bio” Human hair keratins K85 and K35 create unique filament patterns important for early hair formation.
June 2023 in “JAAD case reports” The document concludes that "hot comb alopecia" is now called "central cicatricial centrifugal alopecia" and its causes are complex.
November 2024 in “Journal of Microscopy” Human hair varies in structure based on curl type, with high curl hair showing the most differences.
1 citations
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January 2014 in “Indian Journal of Dermatology, Venereology and Leprology” The 'Swiss cheese' pattern in scalp biopsies can indicate trichotillomania, not just alopecia areata.
59 citations
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August 2024 in “Cell stem cell” 35 citations
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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.
January 2022 in “Springer eBooks” January 2010 in “Springer eBooks”
December 2025 in “Brazilian Journal of Hair Health” The Spiral Model helps understand hair growth changes with age and identify hair problems early.
1 citations
,
February 2023 in “American Journal of Dermatopathology” 101 citations
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April 2013 in “Science” Feather pigment patterns form through melanocyte arrangement and simple regulatory mechanisms.
1 citations
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January 2026 in “Physical review. D/Physical review. D.” Black holes with primary Proca hair can have unique shadows with inner rings, affecting how we observe them.
July 2019 in “Dermatologic Surgery” 2 citations
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June 2001 in “Medical Electron Microscopy” Trichilemmal cysts may form from hair follicle outer root sheath growth.