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Did you mean Pohl-Pinkus constrictions?

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

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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 Dermoscopic And Clinical Features Of Alopecia Areata In Pakistani Patients: A Cross-Sectional Study

January 2025 in “Journal of Rawalpindi Medical College”

Alopecia Areata affects both genders almost equally, mostly on the scalp, with common signs like yellow dots and exclamation mark hairs, especially in young people.