ringed hair disease https://www.malacards.org/card/ringed_hair GARD:0004359 OMIM:180600 SCTID:21926007 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. MEDGEN:75523 Orphanet:169 MESH:C537187 ringed hair UMLS:C0263489 MONDO:0008388 pili annulati hair anomaly