Triangular alopecia - Revision history

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2025-04-08T15:24:38Z

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			{{SI}}
			{{Infobox medical condition
			\| name = Triangular alopecia
			\| image = [[File:Autosomal_dominant_-_en.svg\|200px]]
			\| caption = Triangular alopecia is often inherited in an [[autosomal dominant]] pattern.
			\| synonyms = Congenital triangular alopecia, temporal triangular alopecia
			\| field = [[Dermatology]]
			\| symptoms = [[Hair loss]] in a triangular shape, usually on the [[scalp]]
			\| onset = [[Childhood]]
			\| duration = [[Permanent]]
			\| causes = [[Genetic]] factors
			\| risks = Family history of the condition
			\| diagnosis = [[Clinical diagnosis]]
			\| differential = [[Alopecia areata]], [[Tinea capitis]]
			\| treatment = [[Surgical excision]], [[Hair transplantation]]
			\| frequency = Rare
			}}
	'''Triangular alopecia''', also known as '''temporal triangular alopecia''' or '''congenital triangular alopecia''', is a rare, non-scarring form of [[hair loss]] that typically presents in childhood. It is characterized by a well-defined, triangular or oval patch of hair loss, usually located in the [[temporal region]] of the scalp.		'''Triangular alopecia''', also known as '''temporal triangular alopecia''' or '''congenital triangular alopecia''', is a rare, non-scarring form of [[hair loss]] that typically presents in childhood. It is characterized by a well-defined, triangular or oval patch of hair loss, usually located in the [[temporal region]] of the scalp.

	~~[[File:Autosomal_dominant_-_en.svg\|Autosomal dominant inheritance pattern\|thumb\|left]]~~

	==Presentation==		==Presentation==
	Triangular alopecia is most commonly observed in children, although it can also be diagnosed in adults. The condition is usually unilateral, affecting only one side of the scalp, but bilateral cases have been reported. The affected area is typically devoid of hair, but may contain fine, vellus hairs. The skin in the affected region appears normal, without signs of inflammation or scarring.		Triangular alopecia is most commonly observed in children, although it can also be diagnosed in adults. The condition is usually unilateral, affecting only one side of the scalp, but bilateral cases have been reported. The affected area is typically devoid of hair, but may contain fine, vellus hairs. The skin in the affected region appears normal, without signs of inflammation or scarring.

	==Pathophysiology==		==Pathophysiology==
	The exact cause of triangular alopecia is not well understood. It is believed to be a developmental defect rather than a true form of alopecia. Some studies suggest a possible genetic component, as familial cases have been documented. The condition is not associated with systemic diseases or other dermatological conditions.		The exact cause of triangular alopecia is not well understood. It is believed to be a developmental defect rather than a true form of alopecia. Some studies suggest a possible genetic component, as familial cases have been documented. The condition is not associated with systemic diseases or other dermatological conditions.

	==Diagnosis==		==Diagnosis==
	The diagnosis of triangular alopecia is primarily clinical, based on the characteristic appearance of the hair loss. A [[dermatologist]] may perform a [[trichoscopy]] to examine the hair and scalp more closely. A [[skin biopsy]] is rarely necessary but can be performed to rule out other causes of hair loss. The biopsy would typically show a normal number of hair follicles, with a predominance of vellus hairs.		The diagnosis of triangular alopecia is primarily clinical, based on the characteristic appearance of the hair loss. A [[dermatologist]] may perform a [[trichoscopy]] to examine the hair and scalp more closely. A [[skin biopsy]] is rarely necessary but can be performed to rule out other causes of hair loss. The biopsy would typically show a normal number of hair follicles, with a predominance of vellus hairs.

	==Treatment==		==Treatment==
	Treatment options for triangular alopecia are limited. In some cases, topical [[minoxidil]] may be used to stimulate hair growth, although its effectiveness is variable. Surgical options, such as hair transplantation, can be considered for cosmetic reasons, especially in older children and adults. The decision to treat is often based on the psychological impact of the condition on the patient.		Treatment options for triangular alopecia are limited. In some cases, topical [[minoxidil]] may be used to stimulate hair growth, although its effectiveness is variable. Surgical options, such as hair transplantation, can be considered for cosmetic reasons, especially in older children and adults. The decision to treat is often based on the psychological impact of the condition on the patient.

	==Prognosis==		==Prognosis==
	Triangular alopecia is a benign condition with no associated health risks. The hair loss is permanent, but it does not progress beyond the initial area. The prognosis is excellent in terms of overall health, but the cosmetic appearance can be distressing for some individuals.		Triangular alopecia is a benign condition with no associated health risks. The hair loss is permanent, but it does not progress beyond the initial area. The prognosis is excellent in terms of overall health, but the cosmetic appearance can be distressing for some individuals.

	==Genetics==		==Genetics==
	While the majority of cases are sporadic, there is evidence to suggest a genetic component in some instances. The condition has been observed in multiple members of the same family, suggesting an autosomal dominant pattern of inheritance.		While the majority of cases are sporadic, there is evidence to suggest a genetic component in some instances. The condition has been observed in multiple members of the same family, suggesting an autosomal dominant pattern of inheritance.
			==See also==
	==~~Related pages~~==
	* [[Alopecia areata]]		* [[Alopecia areata]]
	* [[Androgenetic alopecia]]		* [[Androgenetic alopecia]]
	* [[Scarring alopecia]]		* [[Scarring alopecia]]

	[[Category:Dermatology]]		[[Category:Dermatology]]
	[[Category:Hair diseases]]		[[Category:Hair diseases]]
	[[Category:Rare diseases]]		[[Category:Rare diseases]]

Prab at 17:00, 8 March 2025

2025-03-08T17:00:42Z

← Older revision		Revision as of 17:00, 8 March 2025
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	~~{{Short description\|A~~ rare form of hair loss}}		'''Triangular alopecia''', also known as '''temporal triangular alopecia''' or '''congenital triangular alopecia''', is a rare, non-scarring form of [[hair loss]] that typically presents in childhood. It is characterized by a well-defined, triangular or oval patch of hair loss, usually located in the [[temporal region]] of the scalp.
	~~{{Medical resources}}~~

	~~'''Triangular alopecia''', also known as '''temporal triangular alopecia''' or '''congenital triangular alopecia''', is a rare, non-scarring form of~~ [[~~hair loss]] that typically presents in childhood~~. ~~It is characterized by a well-defined, triangular or oval patch of hair loss, usually located in the [[temporal region~~]] ~~of the scalp.~~		[[File:Autosomal_dominant_-_en.svg\|Autosomal dominant inheritance pattern\|thumb\|left]]

	==Presentation==		==Presentation==
	Triangular alopecia is most commonly observed in children, although it can also be diagnosed in adults. The condition is usually unilateral, affecting only one side of the scalp, but bilateral cases have been reported. The affected area is typically devoid of hair, but may contain fine, vellus hairs. The skin in the affected region appears normal, without signs of inflammation or scarring.		Triangular alopecia is most commonly observed in children, although it can also be diagnosed in adults. The condition is usually unilateral, affecting only one side of the scalp, but bilateral cases have been reported. The affected area is typically devoid of hair, but may contain fine, vellus hairs. The skin in the affected region appears normal, without signs of inflammation or scarring.

	~~[[File:Triangular_Alopecia.jpg\|Triangular alopecia in a child\|thumb\|right]]~~

	==Pathophysiology==		==Pathophysiology==
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	==Genetics==		==Genetics==
	While the majority of cases are sporadic, there is evidence to suggest a genetic component in some instances. The condition has been observed in multiple members of the same family, suggesting an autosomal dominant pattern of inheritance.		While the majority of cases are sporadic, there is evidence to suggest a genetic component in some instances. The condition has been observed in multiple members of the same family, suggesting an autosomal dominant pattern of inheritance.

	~~[[File:Autosomal_dominant_-_en.svg\|Autosomal dominant inheritance pattern\|thumb\|left]]~~

	==Related pages==		==Related pages==

Prab: CSV import

2025-03-05T16:36:37Z

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← Older revision		Revision as of 16:36, 5 March 2025
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	{{Short description\|A ~~type~~ of ~~non-scarring~~ hair loss}}		{{Short description\|A rare form of hair loss}}
	{{Medical resources}}		{{Medical resources}}

	'''Triangular alopecia''', also known as '''temporal triangular alopecia''' or '''congenital triangular alopecia''', is a ~~condition~~ characterized by a ~~localized area~~ of hair loss, ~~typically occurring~~ in the temporal region of the scalp~~. This condition is non-scarring, meaning that the hair follicles are not permanently damaged, and it is usually present from birth or early childhood~~.		'''Triangular alopecia''', also known as '''temporal triangular alopecia''' or '''congenital triangular alopecia''', is a rare, non-scarring form of [[hair loss]] that typically presents in childhood. It is characterized by a well-defined, triangular or oval patch of hair loss, usually located in the [[temporal region]] of the scalp.

	==Presentation==		==Presentation==
			Triangular alopecia is most commonly observed in children, although it can also be diagnosed in adults. The condition is usually unilateral, affecting only one side of the scalp, but bilateral cases have been reported. The affected area is typically devoid of hair, but may contain fine, vellus hairs. The skin in the affected region appears normal, without signs of inflammation or scarring.

	[[File:Triangular_Alopecia.jpg\|Triangular alopecia in a child\|thumb\|right]]		[[File:Triangular_Alopecia.jpg\|Triangular alopecia in a child\|thumb\|right]]
	Triangular alopecia typically presents as a well-defined, triangular or oval patch of hair loss on the scalp, most commonly located in the frontotemporal region. The affected area is usually devoid of hair, although some fine vellus hairs may be present. The skin in the area appears normal, without signs of inflammation or scarring.

	The condition is often noticed in early childhood, but it can sometimes be identified later in life. It affects both males and females equally and is usually unilateral, although bilateral cases have been reported.

	==~~Causes~~==		==Pathophysiology==
	The exact cause of triangular alopecia is not well understood. It is believed to be a developmental ~~anomaly~~ rather than a genetic ~~disorder~~, ~~although some~~ familial cases have been documented. The condition is not associated with ~~any~~ systemic diseases or other ~~abnormalities~~.		The exact cause of triangular alopecia is not well understood. It is believed to be a developmental defect rather than a true form of alopecia. Some studies suggest a possible genetic component, as familial cases have been documented. The condition is not associated with systemic diseases or other dermatological conditions.

	==Diagnosis==		==Diagnosis==
	The diagnosis of triangular alopecia is primarily clinical, based on the characteristic appearance of the hair loss. A [[dermatologist]] may ~~use~~ a [[~~dermatoscope~~]] to examine the ~~area~~ more closely. ~~In some cases, a~~ [[skin biopsy]] ~~may~~ be performed to rule out other causes of hair loss, ~~such as [[alopecia areata]] or [[tinea capitis]]~~.		The diagnosis of triangular alopecia is primarily clinical, based on the characteristic appearance of the hair loss. A [[dermatologist]] may perform a [[trichoscopy]] to examine the hair and scalp more closely. A [[skin biopsy]] is rarely necessary but can be performed to rule out other causes of hair loss. The biopsy would typically show a normal number of hair follicles, with a predominance of vellus hairs.

	==Treatment==		==Treatment==
	Treatment for triangular alopecia ~~is not always necessary, as the condition is benign and does not progress~~. ~~However~~, ~~for cosmetic reasons, some individuals~~ may ~~seek treatment options. These can include:~~		Treatment options for triangular alopecia are limited. In some cases, topical [[minoxidil]] may be used to stimulate hair growth, although its effectiveness is variable. Surgical options, such as hair transplantation, can be considered for cosmetic reasons, especially in older children and adults. The decision to treat is often based on the psychological impact of the condition on the patient.

	* '''Topical minoxidil''': This medication can sometimes stimulate hair growth ~~in the affected area~~.
	* '''Surgical options~~''': Hair~~ transplantation can be considered for ~~those seeking a permanent solution~~.

	==Prognosis==		==Prognosis==
	~~The prognosis for individuals with triangular~~ alopecia is ~~excellent, as the~~ condition is ~~non-progressive and~~ does not ~~affect overall health~~. The ~~main concern~~ is cosmetic~~, and treatment is optional based on personal preference~~.		Triangular alopecia is a benign condition with no associated health risks. The hair loss is permanent, but it does not progress beyond the initial area. The prognosis is excellent in terms of overall health, but the cosmetic appearance can be distressing for some individuals.

	==~~Related pages~~==		==Genetics==
	* [[Alopecia areata]]		While the majority of cases are sporadic, there is evidence to suggest a genetic component in some instances. The condition has been observed in multiple members of the same family, suggesting an autosomal dominant pattern of inheritance.
	* [[Hair loss]]
	* [[Dermatology]]

	~~==Genetic Considerations==~~
	[[File:Autosomal_dominant_-_en.svg\|Autosomal dominant inheritance pattern\|thumb\|left]]		[[File:Autosomal_dominant_-_en.svg\|Autosomal dominant inheritance pattern\|thumb\|left]]
	While triangular alopecia is not typically considered a genetic disorder, there have been reports of familial cases suggesting a possible genetic component. In such cases, an autosomal dominant pattern of inheritance has been proposed, although this is not definitively established.

	==~~See also~~==		==Related pages==
	* [[~~List of cutaneous conditions~~]]		* [[Alopecia areata]]
	* [[~~Scalp conditions~~]]		* [[Androgenetic alopecia]]
			* [[Scarring alopecia]]

	[[Category:Dermatology]]		[[Category:Dermatology]]
	[[Category:Hair diseases]]		[[Category:Hair diseases]]
			[[Category:Rare diseases]]

Prab: CSV import

2025-03-04T21:23:56Z

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New page

{{Short description|A type of non-scarring hair loss}}
{{Medical resources}}

'''Triangular alopecia''', also known as '''temporal triangular alopecia''' or '''congenital triangular alopecia''', is a condition characterized by a localized area of hair loss, typically occurring in the temporal region of the scalp. This condition is non-scarring, meaning that the hair follicles are not permanently damaged, and it is usually present from birth or early childhood.

==Presentation==
[[File:Triangular_Alopecia.jpg|Triangular alopecia in a child|thumb|right]]
Triangular alopecia typically presents as a well-defined, triangular or oval patch of hair loss on the scalp, most commonly located in the frontotemporal region. The affected area is usually devoid of hair, although some fine vellus hairs may be present. The skin in the area appears normal, without signs of inflammation or scarring.

The condition is often noticed in early childhood, but it can sometimes be identified later in life. It affects both males and females equally and is usually unilateral, although bilateral cases have been reported.

==Causes==
The exact cause of triangular alopecia is not well understood. It is believed to be a developmental anomaly rather than a genetic disorder, although some familial cases have been documented. The condition is not associated with any systemic diseases or other abnormalities.

==Diagnosis==
The diagnosis of triangular alopecia is primarily clinical, based on the characteristic appearance of the hair loss. A [[dermatologist]] may use a [[dermatoscope]] to examine the area more closely. In some cases, a [[skin biopsy]] may be performed to rule out other causes of hair loss, such as [[alopecia areata]] or [[tinea capitis]].

==Treatment==
Treatment for triangular alopecia is not always necessary, as the condition is benign and does not progress. However, for cosmetic reasons, some individuals may seek treatment options. These can include:

* '''Topical minoxidil''': This medication can sometimes stimulate hair growth in the affected area.
* '''Surgical options''': Hair transplantation can be considered for those seeking a permanent solution.

==Prognosis==
The prognosis for individuals with triangular alopecia is excellent, as the condition is non-progressive and does not affect overall health. The main concern is cosmetic, and treatment is optional based on personal preference.

==Related pages==
* [[Alopecia areata]]
* [[Hair loss]]
* [[Dermatology]]

==Genetic Considerations==
[[File:Autosomal_dominant_-_en.svg|Autosomal dominant inheritance pattern|thumb|left]]
While triangular alopecia is not typically considered a genetic disorder, there have been reports of familial cases suggesting a possible genetic component. In such cases, an autosomal dominant pattern of inheritance has been proposed, although this is not definitively established.

==See also==
* [[List of cutaneous conditions]]
* [[Scalp conditions]]

[[Category:Dermatology]]
[[Category:Hair diseases]]