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GlossaryPohl-Pinkus constrictions

narrow, weakened areas on hair shafts from growth disruptions

Pohl-Pinkus constrictions are narrow, weakened areas along the hair shaft that can occur due to temporary disruptions in hair growth, often caused by physical or emotional stress, illness, or nutritional deficiencies. These constrictions can make the hair more prone to breakage and are sometimes used as indicators of past physiological stress in trichological examinations.

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research Pohl-Pinkus Constrictions of Hair Following Chemotherapy for Hodgkin's Disease

8 citations , February 2005 in “British Journal of Haematology”

Chemotherapy caused the patient's hair to have alternating thick and thin segments.

research Trichoscopy of Alopecia Areata: An Update

89 citations , March 2018 in “The Journal of Dermatology”

Trichoscopy helps diagnose and monitor alopecia areata by looking at a combination of specific hair and scalp features.

research Trichoscopic Clues for the Diagnosis of Alopecia Areata

2 citations , June 2020 in “Türkderm Türk deri hastalıkları ve frengi arşivi”

Yellow dots and short vellus hairs are key signs for diagnosing alopecia areata using trichoscopy.

research Efluvio anágeno. Hallazgos tricoscópicos

January 2020 in “Revista Dermatológica Centro Uraga”

Recognizing trichoscopic features is crucial for diagnosing various hair loss conditions.

research A Prospective Study of Dermoscopic and Ultrastructural Features of Vitiligo-Associated Leukotrichia

December 2023 in “Clinical, cosmetic and investigational dermatology”

The study found that white hair in vitiligo has specific patterns and structures, which vary with the stage of the disease and may be similar to another hair condition.

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