ContentsSynopsisCodesLook ForDiagnostic PearlsDifferential Diagnosis & PitfallsBest TestsManagement PearlsTherapyReferencesView all Images (7)
Halo scalp ring - Hair and Scalp
See also in: Skin
Other Resources UpToDate PubMed

Halo scalp ring - Hair and Scalp

See also in: Skin
Contributors: Mary Gail Mercurio MD, Jeffrey D. Bernhard MD, Lowell A. Goldsmith MD, MPH
Other Resources UpToDate PubMed

Synopsis

Halo scalp ring is a ring or band of alopecia that is several centimeters in width encircling or more commonly partially encircling the head; it may extend along the posterior occipital area, around the temporal portion of the scalp above the ears or onto the forehead. It is associated with caput succedaneum of the scalp in neonates and believed to be secondary to direct pressure (sometimes with underlying necrosis) on the vertex from the cervix during labor. Generally the hair grows back over 6 months without scarring, but there are reported cases of scarring alopecia.

Codes

ICD10CM:
L65.9 – Nonscarring hair loss, unspecified

SNOMEDCT:
205592008 – Congenital localized alopecia

Look For

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Diagnostic Pearls

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Differential Diagnosis & Pitfalls

Other forms of scalp alopecia include cutis aplasia. Secondary forms include infections from scalp probes / monitors, but the contour of the alopecia is helpful in the differential.

Best Tests

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Management Pearls

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Therapy

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References

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Last Updated:11/15/2010
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Halo scalp ring - Hair and Scalp
See also in: Skin
Halo scalp ring : Vertex scalp, Round areas of non-scarring alopecia
Clinical image of Halo scalp ring
Copyright © 2021 VisualDx®. All rights reserved.