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Pili Annulati: A Case Series and Proposal for Classification
Antonio Tirado-Motel1, Maria Fernanda Briseño-Ramos2, Luis García-Valdés3
1Medica+, Los Mochis, Mexico.
Skin Appendage Disorders
|August 8, 2026
Summary
Pili annulati is a hair shaft disorder characterized by alternating light and dark bands on hair shafts. This case series highlights its varied presentation and emphasizes the importance of trichoscopic evaluation for diagnosis.
Area of Science:
- Dermatology
- Genetics
- Trichology
Background:
- Pili annulati is an autosomal dominant hair shaft disorder.
- It presents with characteristic alternating light and dark bands on hair shafts.
- The condition affects scalp, axillary, beard, and pubic hair.
Purpose of the Study:
- To report a case series of patients diagnosed with pili annulati.
- To highlight the clinical and trichoscopic features of pili annulati.
- To emphasize the diagnostic importance of trichoscopy.
Main Methods:
- Clinical evaluation of 7 patients.
- Trichoscopic examination of hair shafts.
- Diagnosis confirmed via clinical and trichoscopic findings.
Main Results:
- Seven patients diagnosed with pili annulati.
- One patient showed unusual eyebrow and eyelash involvement.
- One patient presented with heterochromia; five had diffuse scalp involvement.
Conclusions:
- Pili annulati prevalence may be underestimated.
- Recognizing clinical and trichoscopic features is crucial for diagnosis.
- Trichoscopy is an essential tool for diagnosing pili annulati.
