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    Glossary Hair Types

    categorizes hair by curl pattern, thickness, and structure

    Hair types, also known as hair textures or hair classifications, refer to the categorization of hair based on its curl pattern, thickness, and overall structure. The most common system classifies hair into four main types: Type 1 (straight), Type 2 (wavy), Type 3 (curly), and Type 4 (coily or kinky), with further subcategories (A, B, C) within each type to describe variations in curl tightness and texture. Understanding hair types is crucial for selecting appropriate hair care products and treatments.

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    1. Hair Follicle Dermal Stem Cells Regenerate the Dermal Sheath, Repopulate the Dermal Papilla, and Modulate Hair Type Developmental Cell · 2014 · 184 citations
    2. Hair follicle differentiation: expression, structure and evolutionary conservation of the hair type II keratin intermediate filament gene family Development · 1992 · 65 citations
    3. Identification of the Key Genes Associated with Different Hair Types in the Inner Mongolia Cashmere Goat Animals · 2022 · 30 citations
    4. NF-κB Participates in Mouse Hair Cycle Control and Plays Distinct Roles in the Various Pelage Hair Follicle Types 2017 · 23 citations
    5. How different is human hair? A critical appraisal of the reported differences in global hair fibre characteristics and properties towards defining a more relevant framework for hair type classification International Journal of Cosmetic Science · 2022 · 8 citations
    6. Proteomic analysis identifies differentially expressed proteins participating in forming Type III brush hair in Yangtze River Delta white goat Genetics and molecular research · 2015 · 8 citations
    7. 52711 Benefit of a Selenium Disulfide-based shampoo in subjects of any phototype and hair type presenting with dandruff Journal of the American Academy of Dermatology · 2024
    8. Whole transcriptome sequencing of different hair types in inner Mongolian cashmere goats BMC Genomics · 2026
    9. Novel Type I Hair Keratins K39 and K40 Are the Last to be Expressed in Differentiation of the Hair: Completion of the Human Hair Keratin Catalog Journal of Investigative Dermatology · 2007 · 70 citations
    10. Hair Removal With the 3-msec Alexandrite Laser in Patients With Skin Types IV-VI: Efficacy, Safety, and the Role of Topical Corticosteroids in Preventing Side Effects Journal of Drugs in Dermatology · 2007 · 21 citations
    11. Cell Types Promoting Goosebumps Form a Niche to Regulate Hair Follicle Stem Cells Cell · 2020 · 77 citations
    12. Unique amino acid signatures that are evolutionarily conserved distinguish simple-type, epidermal and hair keratins Journal of Cell Science · 2011 · 76 citations
    13. Isolation and Molecular Cloning of Epidermal- and Hair Follicle-Specific Peptidylarginine Deiminase (Type III) from Rat The Journal of Biochemistry · 1997 · 42 citations
    14. Innate type 2 immunity controls hair follicle commensalism by Demodex mites Immunity · 2022 · 24 citations
    15. Structural features of the α-type filaments of the inner root sheath cells of the guinea pig hair follicle Biochemistry · 1978 · 24 citations
    16. Detection of human papillomavirus type 56 DNA, belonging to a mucous high-risk group, in hair follicles in the genital area of a woman no longer suffering from viral warts British Journal of Dermatology · 2004 · 21 citations
    17. Protopanaxatirol type ginsenoside Re promotes cyclic growth of hair follicles via inhibiting transforming growth factor β signaling cascades Biochemical and Biophysical Research Communications · 2016 · 14 citations
    18. Various Types of Minor Trauma to Hair Follicles During Follicular Unit Extraction for Hair Transplantation Plastic and reconstructive surgery. Global open · 2017 · 14 citations
    19. The Human Papillomavirus Type 11 Upstream Regulatory Region Triggers Hair-Follicle-Specific Gene Expression in Transgenic Mice Journal of Investigative Dermatology · 1999 · 9 citations
    20. A randomized pilot study to compare hair follicle cell suspensions prepared using trypsin alone versus trypsin in combination with collagenase type I for transplantation in vitiligo Clinical and experimental dermatology · 2019 · 5 citations
    21. Cutaneous malignant melanoma incidences analyzed worldwide by skin type over advancing age of males and females: Evidence estrogen and androgenic hair are risk factors Journal of epidemiological research · 2016 · 3 citations
    22. Recombinant Type XVII Collagen Promotes Hair Growth by Activating the Wnt/β-Catenin and SHH/GLI Signaling Pathways Cosmetics · 2025
    23. Distribution of Type XII and XIV Collagens in Bovine Dermis and Hair Follicles Connective tissue · 2001
    24. Five Types of Hair Loss Zenodo (CERN European Organization for Nuclear Research) · 2020
    25. Types of Hair Dye and Their Mechanisms of Action Cosmetics · 2015 · 84 citations
    26. Characterization of a 300 kbp Region of Human DNA Containing the Type II Hair Keratin Gene Domain Journal of Investigative Dermatology · 2000 · 77 citations
    27. Androgen Regulation of the Human Hair Follicle: The Type I Hair Keratin hHa7 Is a Direct Target Gene in Trichocytes Journal of Investigative Dermatology · 2004 · 49 citations
    28. Regulation of Hair Shedding by the Type 3 IP3 Receptor 2012 · 19 citations
    29. Long pulsed Nd: YAG laser with inbuilt cool sapphire tip for long term hair reduction on type- IV and V skin: A prospective analysis of 200 patients Indian journal of dermatology, venereology, and leprology · 2010 · 10 citations
    30. Hair removal options in darker skin types through laser innovation and energy-based modalities International Journal of Research in Dermatology · 2025