January 2023 in “Figshare” Mouse skin and hair aging starts at 200 days, with changes in hair follicles and more white hairs as signs of aging.
January 2011 in “Bradford Scholars (University of Bradford)” Testosterone stimulates growth in intermediate hair follicles, but this can be blocked by cyproterone acetate.
April 2017 in “Journal of Investigative Dermatology” Early and late matrix progenitors in hair follicles create different cell layers, with early ones forming the companion layer and later ones forming the inner root sheath and hair shaft.
71 citations
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June 2005 in “Journal of Investigative Dermatology” PAD enzymes play a key role in hair growth and structure.
1 citations
,
January 2019 in “Springer eBooks” Hidradenitis Suppurativa is a chronic skin condition best treated early with surgery for better outcomes and less recurrence.
34 citations
,
July 1958 in “Biochimica et Biophysica Acta” 9 citations
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January 1975 in “PubMed” Nude mice are hairless due to a shared defect affecting both skin and thymus, not just thymic issues.
May 2006 in “Dermatologic Surgery” Most nonbald men's multi-hair follicles are naturally positioned perpendicular to a line from the scalp's crown, which is important for natural-looking hair transplants.
10 citations
,
January 2003 in “Seminars in reproductive medicine” The article explains how to identify and treat excessive hair growth in women, which can be distressing and may signal other health problems.
April 2017 in “Journal of Investigative Dermatology” Sweat glands and hair follicles are determined by opposing signals, with BMPs promoting sweat glands and blocking BMPs leading to hair follicles.
7 citations
,
January 2012 in “International journal of trichology” Permanent hair removal with lasers may cure itchy black hair bristles on the back.
Transplanted rat hair follicles grew hair and had increased but not fully restored nerve connections in mice.
February 2018 in “Dermatologic Surgery” Nonshaven follicular unit extraction is a highly satisfactory method for restoring pubic hair.
June 2020 in “Journal of cosmetic medicine” Eyebrow transplants use hair from the scalp or pubic area, with blonde hair looking more natural, and can leave scars depending on the method used.
4 citations
,
November 2004 in “Clinical and Experimental Dermatology” Hair length and thickness are related, with thickness peaking at about a quarter of the hair's maximum length.
December 2010 in “Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature” New cells join the hair's dermal papilla during the growth phase, possibly affecting hair thickness.
19 citations
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March 2015 Human hair has electromagnetic properties.
14 citations
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March 2019 in “Facial Plastic Surgery Clinics of North America” Hair transplantation can help transgender patients affirm their gender identity.
April 2022 in “Our Dermatology Online” A woman had unusual hair growth on one side of her chin without a known cause.
24 citations
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September 2014 in “PloS one” Thyroid hormone receptors are essential for hair growth and wound healing.
1 citations
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October 2021 in “The journal of investigative dermatology/Journal of investigative dermatology” Removing HIF-P4H-2 from certain skin cells in mice causes hair loss on the body but not the head.
4 citations
,
November 2003 in “Annals of Plastic Surgery” Hair from the head was successfully used to restore pubic hair, with additional procedures suggested for more natural results.
36 citations
,
July 1988 in “Archives of Dermatological Research” Pili annulati is caused by a protein metabolism disorder affecting hair structure.
22 citations
,
January 2010 in “Clinical Medicine Insights Endocrinology and Diabetes” Forearm hair has more cortisol than lower leg hair.
7 citations
,
August 2005 in “Evolutionary anthropology” Human hair is unique and important for understanding human evolution and identity.
5 citations
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January 2004 in “Annals of Dermatology” People with androgenetic alopecia (AGA) have lower hair density and more single-hair units compared to those with normal scalps.
January 1992 in “Proceedings of the New Zealand Society of Animal Production” Ferret hair growth starts between 0 and 4 days after melatonin treatment, with cell growth peaking in the hair germ and declining as the hair matures.
6 citations
,
August 2008 in “Journal of Forensic Sciences” Recognizing specific tissue types on telogen hair roots can improve DNA typing.
5 citations
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September 1998 in “Atlas of the oral and maxillofacial surgery clinics of North America” Hair transplantation and micrografting, used for baldness, involve moving hair follicles from hair-rich to bald areas, requiring careful procedure and post-care for success.
25 citations
,
April 2008 in “Archives of Dermatological Research” Encapsulated human hair cells can substitute for natural hair cells to grow hair.