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

TLDR Rectangular black granules, solitary yellow dots, and mostly single-hair follicles suggest Loose Anagen Hair Syndrome.

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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