Video:Halo nevus
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Description
Halo nevus is a mole that is surrounded by a pale ring or 'halo'.[1]
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When and where
It is generally noticed in the summer when the surrounding skin tans, and usually occurs on the chest, though can be anywhere.[1]
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Number
There may be one or more typically several.[2]
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Onset
Onset is usually in teenagers and young adults.[1][3]
Pattern1
It typically follows a pattern of appearing at first as a dark mole surrounded by a halo before the nevus fades and disappears.[1]
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Pattern2
A single halo nevus like lesion appearing in an older adult may be a melanoma.[1]
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Evolution
The central dark part tends to turn pink before becoming pale, and then its color returns.[2]
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Associations
Halo nevi are associated with vitiligo, Turner's syndrome, and treatment with infliximab.[2]
Mechanism
The formation of a halo surrounding a nevus is believed to occur when certain white blood cells destroy the pigment-producing cells of the skin.[2]
Epidemiology
It occurs in around 1% of the general population, and males and females are affected equally.[1]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 DE, Elder; D, Massi; RA, Scolyer; R, Willemze (2018). "2. Melanocytic tumours: halo naevus". WHO Classification of Skin Tumours. Vol. 11 (4th ed.). Lyon (France): World Health Organization. pp. 91–92. ISBN 978-92-832-2440-2. Archived from the original on 2022-07-11. Retrieved 2022-08-12.
- ↑ 2.0 2.1 2.2 2.3 James, William D.; Elston, Dirk; Treat, James R.; Rosenbach, Misha A.; Neuhaus, Isaac (2020). "30. Melanocytic nevi and neoplasms: halo nevus". Andrews' Diseases of the Skin: Clinical Dermatology (13th ed.). Edinburgh: Elsevier. pp. 690–691. ISBN 978-0-323-54753-6. Archived from the original on 2022-08-23. Retrieved 2022-08-12.
- ↑ Johnstone, Ronald B. (2017). "32. Lentigines, nevi and melanomas". Weedon's Skin Pathology Essentials (2nd ed.). Elsevier. p. 536. ISBN 978-0-7020-6830-0. Archived from the original on 2021-05-25. Retrieved 2022-08-12.