October 2025 in “Diagnostics” In this case study, an 18-year-old woman's triangular alopecic patch diagnosed as temporal triangular alopecia was considered non-progressive and had no impact on her quality of life, so no treatment was initiated.
In this case study, researchers reported the first documented instance of malignant transformation of congenital triangular alopecia into basal cell carcinoma in a 48-year-old woman, underscoring the importance of assessing long-standing alopecic areas for malignancy.
July 2025 in “International Journal of Trichology” This study reported six pediatric cases of temporal triangular alopecia and highlighted the use of trichoscopy to distinguish it by detecting a distinctive carpet of vellus hair, helping to differentiate TTA from other hair loss conditions.
January 2025 in “Surgical & Cosmetic Dermatology” This article reviews temporal triangular alopecia, emphasizing the utility of dermoscopy for diagnosis, and reports no new clinical treatment findings.
January 2025 in “Surgical & Cosmetic Dermatology” This article reviews a case of alopecia triangularis temporalis, emphasizing the need for histopathological confirmation to avoid misdiagnosis and highlighting surgical correction as the preferred treatment for confirmed cases.
July 2024 in “LA CIENCIA AL SERVICIO DE LA SALUD Y NUTRICIÓN” In this report, a newborn female with bilateral symmetrical alopecia lesions was diagnosed with congenital triangular alopecia, an unusual presentation, highlighting the disorder's benign nature and the importance of early recognition and conservative management.
May 2024 in “Clinical, cosmetic and investigational dermatology” This case report describes an adolescent boy with congenital triangular alopecia who showed significant hair regrowth after eight months of treatment with 5% topical minoxidil, achieving full coverage of the affected area without adverse effects.
April 2024 in “Indian Journal of Paediatric Dermatology” This case report highlights a rare association between congenital triangular alopecia and vitiligo, noting that treatment with tofacitinib improved the patient's vitiligo but not the alopecia.
April 2023 in “The Medical Journal of Australia” In this case report, a five-year-old girl with a bald patch was diagnosed with congenital triangular alopecia, a localized non-scarring condition that typically remains unchanged and lacks effective treatment.
January 2023 in “Indian Dermatology Online Journal” This case report identifies a 23-year-old man with congenital triangular alopecia, a non-scarring alopecia characterized by preserved follicles and vellus hair, for which unnecessary interventions should be avoided.
December 2020 in “TURKDERM” This case report describes a 3-year-old boy diagnosed with temporal triangular alopecia, emphasizing the importance of clinical and dermoscopic examination for correct diagnosis due to the condition's rarity and risk of misdiagnosis.
This case report highlights the clinical and trichoscopic diagnosis of congenital triangular alopecia in a 9-month-old boy and notes the condition's typical unresponsiveness to traditional treatments.
January 2020 in “Przegla̧d dermatologiczny” A 5-year-old boy was diagnosed with congenital triangular alopecia, a type of hair loss without skin changes, usually starting between ages 2-5, with no specific treatment.
January 2019 in “Revista Dermatológica Centro Uraga” This review discusses congenital temporal triangular alopecia, focusing on its clinical presentation and dermatoscopic diagnosis, and highlights the limited understanding of its etiology and treatment options; it reports no new clinical results.
January 2018 in “Springer eBooks” Congenital triangular alopecia is a harmless, non-spreading hair loss condition often seen in young children.
April 2016 in “Journal of The American Academy of Dermatology” The study found that Temporal Triangular Alopecia often starts in early childhood, mainly affects the left side of the scalp, and has no effective treatment except surgery.
April 2012 in “Informa Healthcare eBooks” Temporal triangular alopecia is a lifelong condition with hairless patches on the side of the head that may be present from birth.
March 2012 in “Journal of The American Academy of Dermatology” This study found that white females with female pattern hair loss had higher hair density in the occipital scalp area, while Asian females had thicker hair diameters in both frontal and occipital areas.
November 2009 in “Actas dermo-sifiliográficas/Actas dermo-sifiliográficas” Hair transplantation effectively treated a bald patch in an 18-year-old woman with Temporal Triangular Alopecia.
January 2023 in “Australasian Journal of Dermatology” Sublingual minoxidil helped regrow hair in a person with congenital triangular alopecia.
January 2020 in “International Journal of Trichology” This study reported that platelet-rich plasma injections led to only temporary improvement in vellus hair characteristics in temporal triangular alopecia, suggesting it may not be an effective long-term treatment.
33 citations
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September 1987 in “American Journal of Medical Genetics” This study documents dominant transmission and complete penetrance of uncombable hair syndrome in a family, despite the father lacking visible abnormalities.
8 citations
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May 2005 in “The American journal of dermatopathology/American journal of dermatopathology” This study observed unique ultrastructural changes in a 4-year-old girl with pili trianguli et canaliculi that may affect hair shaft surface characteristics due to inner root sheath alterations.
10 citations
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January 2011 in “Case reports in dermatological medicine” This report documented a successful and sustained hair restoration surgery using follicular unit transplantation for temporal triangular alopecia, lasting over six years.
2 citations
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November 1999 in “Hair transplant forum international” This commentary discusses the rarity of "triangular alopecia" in hair restoration surgery and highlights the lack of mention in professional settings, without providing new clinical data.
36 citations
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June 2018 in “Journal of The American Academy of Dermatology” This review examines the increasing clinical applications of dermoscopy in diagnosing various skin conditions and highlights its potential to improve diagnostic accuracy and reduce unnecessary histologic confirmation.
30 citations
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May 2004 in “Journal der Deutschen Dermatologischen Gesellschaft” This review proposes a classification system for childhood hair loss based on clinical appearance, age of onset, and associated symptoms, but reports no new clinical results.
11 citations
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July 2019 in “Pediatric dermatology” In this study, empty follicular openings and pigtail hairs were more frequently observed in children with alopecia areata compared to adults, while yellow dots were less common in children.
6 citations
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August 1993 in “Archives of Dermatology” This article describes the first documented case of acquired uncombable hair syndrome in a 39-year-old woman, contributing to the understanding of this rare condition.
2 citations
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September 2023 in “Journal of the Egyptian Womenʼs Dermatologic Society” This study concluded that exclamation mark hairs are the most reliable marker of disease activity in alopecia areata, with broken hairs, triangular hairs, and black dots also increasing the probability of active disease.