19 citations
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February 2013 in “The American Journal of Dermatopathology” Nonscarring alopecia has higher hair density than scarring alopecia, and hair density can help diagnose the type of alopecia.
Higher PD-1 levels mean fewer CD8+ T cells in alopecia areata hair follicles.
February 2023 in “bioRxiv (Cold Spring Harbor Laboratory)” Merkel cells stabilize nerve endings in the skin, and they change independently of each other.
January 2025 in “International Journal of Dermatology” Afro-textured hair in indigenous South Africans has lower density and unique features, needing specific evaluation standards.
34 citations
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July 2006 in “The Journal of Comparative Neurology” Increasing neurotrophin 4 in skin boosts nerve endings but not sensory neuron count.
6 citations
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June 2016 in “The anatomical record” Dogs have varying numbers of touch-sensitive Merkel cells in different skin areas, with most in the oral mucosa and facial skin, unrelated to age, sex, breed, or color.
May 2020 in “bioRxiv (Cold Spring Harbor Laboratory)” The study found that certain genes are important for hedgehog skin appendage development and immunity, with spines possibly evolving for protection and infection resistance.
September 2022 in “International Journal of Trichology” Trichoscopic measurements help determine the severity of female pattern hair loss.
6 citations
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August 2013 in “Facial plastic surgery clinics of North America” Dense packing fits many hair grafts closely together for a natural look but isn't suitable for everyone.
211 citations
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April 2013 in “Development” More dermal papilla cells in hair follicles lead to larger, healthier hair, while fewer cells cause hair thinning and loss.
46 citations
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April 1987 in “Brain Research”
155 citations
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May 2016 in “Nature communications” Memory T cells in the skin balance staying put and moving into the blood, clustering around hair follicles, and increasing in number after infection.
11 citations
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October 2018 in “The Journal of Dermatology” Decorin helps keep hair follicle stem cells and may prevent age-related hair loss.
10 citations
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December 2015 in “International Journal of Molecular Sciences” PDCD4 is important for controlling skin cell growth and healing.
15 citations
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December 1972 in “Journal of Investigative Dermatology”
66 citations
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July 2007 in “Journal of Molecular Medicine” Stress increases certain chemicals in the skin and nerves, which might worsen skin conditions.
2 citations
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March 2009 in “Hair transplant forum international” Men generally have a certain thickness of hair at their hairline.
January 2015 in “프로그램북(구 초록집)” Many Korean women with female-pattern hair loss have reduced hair density at the temples.
10 citations
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January 2013 in “Stem Cells and Development” Scientists identified a unique type of human skin stem cell that could help with tissue repair.
1 citations
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May 2025 in “Animal Bioscience” Four genes affect hair follicle density in goats.
September 2023 in “Journal of the American Academy of Dermatology” Dermatologists can accurately detect smaller differences in hair density than previously thought.
December 2024 in “Skin Appendage Disorders” Traction alopecia reduces hair density and thickness; proper hair care can help prevent it.
2 citations
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June 2016 in “International journal of experimental pathology” Human skin has less GDNF and its receptor with age.
30 citations
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January 1999 in “Journal of Cutaneous Pathology” Spiny keratoderma may be ectopic hair formation on palms and soles.
110 citations
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January 1995 in “European Journal of Neuroscience” Glycine is a key transmitter in rat spinal cord synapses, often alongside GABA.
17 citations
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May 2021 in “Journal of Cell Science” N1-acetylspermidine promotes hair follicle stem cell self-renewal.
July 2022 in “Journal of Investigative Dermatology” Substance P may contribute to hair loss by increasing oxidative stress and mitochondrial activity in hair follicles.
April 2023 in “Journal of clinical and translational science”
129 citations
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June 1999 in “Archives of Dermatology” African Americans have less hair density than whites.
1 citations
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December 2022 in “Clinical, Cosmetic and Investigational Dermatology” Midscalp hair density and terminal hair percentage are good indicators of female pattern hair loss severity.