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Ringed hair disease

Synonym(s) Pili annulati
Prevalence Unknown
Inheritance Autosomal dominant
or Not applicable
Age of onset Childhood
  • Q84.1
  • C0263489
  • C537187
MedDRA -


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.

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