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Ringed hair disease

Disease definition

Pili annulati is an isolated, benign hair shaft abnormality, usually presenting after the age of 2 and affecting the hair of the scalp or very rarely beard, axillary, or pubic hair, that is characterized by a banded or speckled appearance due to alternating light bands (corresponding to air-filled cavities within the cortex of the affected hair shafts) and dark bands. The bands have a lifelong duration, may only be detectable under light microscopy, are more apparent in fair-colored hair or with age-related graying, and have no effect on hair growth or fragility in the vast majority of cases.


  • Synonym(s):
    • Pili annulati
  • Prevalence: Unknown
  • Inheritance: Autosomal dominant or Not applicable 
  • Age of onset: Childhood
  • ICD-10: Q84.1
  • OMIM: 180600
  • UMLS: C0263489
  • MeSH: C537187
  • GARD: 4359  4725
  • MedDRA: -

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