5 citations
,
March 2009 in “Pediatric Dermatology” The study found that pili bifurcati causes hair to intermittently split into two branches, each with its own outer layer.
1 citations
,
August 2024 in “Pediatric Dermatology” A rare, harmless hair condition was found in an infant's eyebrow, needing no treatment.
June 2024 in “Annals of Medicine and Surgery” A 23-year-old Syrian woman has two rare hair disorders, and avoiding hair treatments plus using vitamins and minoxidil may help.
5 citations
,
January 2009 in “International Journal of Trichology” Two siblings had a rare hair condition with banded hair, which doesn't need treatment.
23 citations
,
July 1994 in “Journal of Dermatological Science” Pili torti hair twists due to uneven outer root sheath cell development.
9 citations
,
August 2021 in “Journal of clinical medicine” Pili torti is a rare condition where hair is twisted and breaks easily, often linked to genetic disorders or other health issues.
4 citations
,
November 2016 in “The Journal of Dermatology” Pili torti hair is fragile due to loose keratin filaments and weak disulfide bonds.
15 citations
,
March 1996 in “PubMed” Anorexia nervosa may cause a hair defect called pili torti due to malnutrition and high vitamin A levels.
1 citations
,
July 2023 in “Cureus” A rare hair disorder with multiple hairs from one follicle was found on a patient's abdomen.
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.
The arrector pili muscle plays a key role in hair loss in androgenetic alopecia.
28 citations
,
January 1985 in “Journal of the American Academy of Dermatology” A girl with citrullinemia developed pili torti, suggesting a link between the hair condition and the metabolic disorder.
14 citations
,
July 2016 in “Anatomical Science International” The study suggests that the arrector pili muscle is important for hair health and its damage might contribute to hair loss.
Hair dysplasias involve various hair disorders causing fragility, breakage, and poor hair adhesion.
Genetic factors might cause fibrosing alopecia linked to hair shaft abnormalities.
10 citations
,
January 1925 in “Archives of Dermatology” Trichostasis spinulosa is a rare skin condition with hair-filled plugs in hair follicles.
January 2021 in “Nasza Dermatologia Online” Plica polonica is a rare condition where hair becomes irreversibly tangled, and the treatment is to cut the matted hair.
6 citations
,
February 2020 in “Journal of Cutaneous Pathology” Nevus psiloliparus lacks mature hair follicles but keeps other skin structures intact.
2 citations
,
May 2022 in “International journal of trichology” Plica neuropathica is a tangled hair condition that may be caused by hair damage or psychiatric issues and is treated by cutting the hair and addressing mental health.
January 2023 in “Skin appendage disorders” Two Hispanic women developed Plica neuropathica, a condition causing tangled hair, possibly due to hair damage and various risk factors.
15 citations
,
February 2000 in “Journal of Cutaneous Pathology” The arrector pili muscle attaches to the extracellular matrix using α5β1 integrin and connects muscle cells using α1β1 integrin.
September 2016 in “Journal of Dermatological Science” Björnstad syndrome causes twisted hair from birth.
July 2025 in “Case Reports in Dermatology” Early detection and treatment are crucial to prevent irreversible hair loss in Lichen Planopilaris.
5 citations
,
November 1979 in “PubMed” A hereditary condition causes hair loss and twisted hair in some family members.
31 citations
,
January 2014 in “International Journal of Trichology” The arrector pili muscle might play a role in hair loss and needs more research to understand its impact.
6 citations
,
February 2013 in “Veterinary Dermatology” A young cat had a rare hair condition with twisted hair shafts but stayed healthy.
22 citations
,
July 2012 in “International Journal of Trichology” Miniaturized hairs stay connected to muscle in alopecia areata, allowing possible regrowth, but not in androgenetic alopecia.
September 2025 in “Cureus” Plica neuropathica can occur with diffuse alopecia and should be considered in diagnosis.
February 2026 in “International Journal of Homoeopathic Sciences” Plica Polonica is a rare hair disorder causing severe matting, managed by detangling or cutting, and prevented with regular hair care.
24 citations
,
September 2002 in “Dermatologic Surgery” The study found that hair follicles are above muscle connections in the scalp, which may help protect stem cell areas.