Trichoscopy Findings in Loose Anagen Hair Syndrome: Rectangular Granular Structures and Solitary Yellow Dots

March 2015 in “ Journal of Dermatological Case Reports ”

Adriana Rakowska, Małgorzata Zadurska, Joanna Czuwara, Olga Warszawik‐Hendzel, Marta Kurzeja, Małgorzata Maj, Małgorzata Olszewska, Lidia Rudnicka

Loose Anagen Hair Syndrome LAHS trichoscopy rectangular black granular structures solitary yellow dots follicular units single hairs alopecia areata telogen effluvium

Studysummary This study identified distinctive trichoscopic features that may aid in diagnosing loose anagen hair syndrome, such as rectangular black granular structures, solitary yellow dots, and a predominance of follicular units with single hairs. Our plain-language summary of this paper — not a Tressless recommendation.

The study investigated trichoscopic features to diagnose Loose Anagen Hair Syndrome (LAHS) in 89 children, including 24 with LAHS, 25 with alopecia areata, 20 with telogen effluvium, and 20 healthy controls. It found that 71% of LAHS patients had rectangular black granular structures, which were distinct from the dense black dots in alopecia areata patients. Additionally, 50% of LAHS patients had solitary yellow dots, which were absent in the control group and telogen effluvium patients. A significant finding was that 92.9% of LAHS patients had a predominance of follicular units with single hairs, compared to lower percentages in other groups. The study concluded that these trichoscopic features—rectangular black granular structures, solitary yellow dots, and a predominance of follicular units with single hairs—are indicative of LAHS.

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Research cited in this study

11 / 11 results

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31 citations , December 2010 in “Journal of the American Academy of Dermatology”

This study reports that structural abnormalities in the inner root sheath of hair follicles may cause the hair shaft to be loosely attached in patients with loose anagen hair syndrome.

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46 citations , October 2009 in “Archives of Dermatology”

This study found that loose anagen hair syndrome is a common form of alopecia in young girls, typically presenting with thin, sparse hair and usually confirmed by a hair-pull test.

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This abstract provides no results; it is a website notification about cookies and general access to JAMA content.

research Trichoscopy in Genetic Hair Shaft Abnormalities

74 citations , July 2008 in “Journal of Dermatological Case Reports”

This study found that trichoscopy can diagnose genetic hair shaft abnormalities without plucking or cutting hair, by visualizing characteristic features in a single session.

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