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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 Telogen Effluvium Due to Recombinant Interferon Alpha-2b

45 citations, January 1992 in “Dermatology”

Half of the patients treated with a specific drug for skin cancer experienced hair loss not related to the drug's dosage.

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 Trichoscopic Aspects of Alopecia Areata in Children: A Series of 30 Cases

January 2023 in “Asian Journal of Pediatric Research”

Trichoscopy is crucial for diagnosing and assessing alopecia areata in children.

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.

research Hair Loss Pattern Due to Chemotherapy-Induced Anagen Effluvium: A Cross-Sectional Observation

53 citations, January 2007 in “Dermatology”

Chemotherapy often causes patterned hair loss, with some scalp areas more resistant to hair loss than others.

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