ringed hair disease
Findings
No curated finding names ringed hair disease yet. Everything below is reference data from Mondo, HPO and GenCC, not evidence about what affects it.
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.
Definition from the Mondo Disease Ontology (MONDO:0008388), read 2026-09-29. CC BY 4.0.
Features
2 features
What the disease is reported to present with, and how often among people who have it — never how often a feature means the disease. HPO, annotations 2026-09-02.
- Abnormal hair patternHPOHP:0010720
- Very frequent (80% to 99% of cases)
- Fine hairHPOHP:0002213
- Very frequent (80% to 99% of cases)
Where it sits
- A kind of
Other names
1 name
Resolves to: ringed hair disease
- Also called
- pili annulati