4 citations
,
March 2020 in “JAAD Case Reports” Vitamin B12 deficiency can cause darkening of all nails.
29 citations
,
June 2016 in “Experimental Dermatology” MCHR2 gene duplications may be linked to alopecia areata.
4 citations
,
January 2018 in “JEADV. Journal of the European Academy of Dermatology and Venereology/Journal of the European Academy of Dermatology and Venereology” Panitumumab can cause excessive ear hair growth.
31 citations
,
February 1999 in “Dermatologic surgery” Sun exposure after laser hair removal can cause skin darkening, which is hard to treat and requires avoiding UV light.
2 citations
,
August 2024 in “Indian Dermatology Online Journal” Premature graying of hair is mainly caused by genetics, stress, and environment, with potential treatments being explored.
2 citations
,
November 2024 in “JAAD reviews.” Certain drugs can change hair color, either lightening or darkening it.
October 2025 in “Journal of Veterinary Diagnostic Investigation” Black hair in cats has higher cortisol levels than white hair.
101 citations
,
June 2005 in “Journal of The American Academy of Dermatology” Very few people experience increased hair growth after laser hair removal, especially those with darker skin and black hair.
8 citations
,
February 2005 in “British Journal of Haematology” Chemotherapy caused the patient's hair to have alternating thick and thin segments.
46 citations
,
April 2014 in “PLOS ONE” Gray hair may be caused by lower antioxidant activity in hair cells.
January 2024 in “International Journal of Herbal Medicine” Melanin is important for hair color, health, and UV protection.
7 citations
,
March 2003 in “PubMed” The scalp has a natural speckled pattern of increased pigment around hair follicles, possibly linked to local hormone production.
2 citations
,
March 2016 in “Serbian Journal of Dermatology and Venerology” A six-year-old boy with excessive hair growth and other symptoms may have a genetic link on chromosome 17q, requiring regular medical follow-ups.
November 2025 in “World Journal of Biology Pharmacy and Health Sciences” Premature greying in kids can signal health issues like vitamin deficiencies or thyroid problems, which can be treated.
13 citations
,
July 2016 in “Indian Journal of Dermatology” DPR can show different hair characteristics, as seen in two brothers with normal hair.
1 citations
,
February 2014 in “Italian journal of medicine” An 80-year-old woman with Cronkhite-Canada syndrome had multiple polyps and symptoms like diarrhea, hair loss, nail issues, and dark skin.
April 2015 in “Dentistry 3000” Premature hair graying in the face may be influenced by genetics and environment.
July 2025 in “Journal of Cutaneous Pathology” Early skin biopsy is crucial for diagnosing Conradi-Hünermann-Happle syndrome.
25 citations
,
May 1995 in “Journal of the American Academy of Dermatology” Erythromelanosis follicularis faciei can also affect women, though it's rare.
January 2026 in “JCEM Case Reports” A rare case of Cushing's syndrome and pheochromocytoma requires careful re-evaluation to avoid complications.
April 2017 in “The journal of investigative dermatology/Journal of investigative dermatology” A girl with excessive hair growth had a genetic change on chromosome 17 that reduced the activity of two genes linked to hair growth.
2 citations
,
July 2019 in “Indian dermatology online journal” A 17-year-old girl and her brothers have a rare hair condition with long eyelashes, thick eyebrows, and easily pluckable hair.
2 citations
,
January 2007 in “Actas Dermo-Sifiliográficas” Two cases of hairy elbows syndrome were described, with normal skin texture and symmetrical hair growth.
March 2026 in “Mendeley Data” March 2026 in “Mendeley Data” 1 citations
,
September 2008 in “International Journal of Cosmetic Science” Using chelants in hair dye reduces fiber damage by preventing harmful radicals.
26 citations
,
October 1998 in “Experimental Dermatology” A keratin hHb6 mutation causes a hair disorder with varying severity, influenced by other factors.
1 citations
,
April 2018 in “Turkish Journal of Dermatology” Childhood hypertrichosis is excessive hair growth not linked to hormones, with types based on location and origin.
1 citations
,
April 2015 in “International Journal of Pediatrics and Adolescent Medicine” Cyclosporine-A can cause excessive hair growth, which usually stops after discontinuing the drug.
October 2025 in “Journal of the Endocrine Society” Ovarian hyperthecosis can cause high testosterone and symptoms like hair loss, and surgery can help improve these symptoms.