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Woolly hair nevus (WHN) is a rare non-familial hair anomaly characterized by kinky, tightly coiled, and hypopigmented fine hair with an average diameter of 0.5 cm, noted, since birth or during the first two years of life, in a localized circumscribed distribution on the scalp. Occasionally, WHN grows in areas observed to be alopecic in the neonatal period. WHN can be associated with features like ocular defects (persistent pupillary membrane, retinal defects), precocious puberty, and epidermal nevi.
Features include very common findings: Curly hair, Fine hair, Patchy hypopigmentation of hair, and Woolly scalp hair; and common findings: Congenital posterior occipital alopecia and Verrucous epidermal nevus. 12 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Skin | 1 | Congenital posterior occipital alopecia |
Phenotype severity distribution: 4 very common features, 2 common features.
No clinical trials have been registered for wooly hair nevus.
1 publication has been identified in PubMed for wooly hair nevus. Research spans Epidemiology / Natural History (100%).
Herlin LK (2024). [PMID: 39623400](https://pubmed.ncbi.nlm.nih.gov/39623400/). *Orphanet J Rare Dis*. [Epidemiology / Natural History]
Data assembled from 4 of 12 sources · Last updated Sep 19, 2026, 7:51 AM UTC
European rare disease database
Genetic and Rare Diseases Info Center
Pregnancy and birth
1 |
Congenital posterior occipital alopecia |
Ears | 1 | Enlarged vestibular aqueduct |
Hormones | 1 | Precocious puberty |