alexa Unusual halo nevi--darkening rather than lightening of the central nevus.
Dermatology

Dermatology

Dermatology and Dermatologic Diseases

Author(s): Huynh PM, Lazova R, Bolognia JL, Huynh PM, Lazova R, Bolognia JL

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Abstract Although the classic halo nevus is a brown nevus with a surrounding rim of depigmentation, i.e. a stage I halo nevus, these nevi can have several clinical stages. The central nevus may lose its pigmentation and appear pink with a surrounding halo (stage II), the central papule may disappear leading to a circular area of depigmentation (stage III) or the depigmented area may repigment (stage IV), leaving no trace of its prior existence. Herein we describe an unusual phenomenon--darkening of the central nevus rather than lightening--following the appearance of the halo phenomenon. An 18-year-old boy who had multiple atypical nevi developed multiple halo nevi beginning at the age of 12 years. Following the appearance of the peripheral halos, 2 of his nevi that were originally solid medium brown in color darkened and the hyperpigmentation had a reticulated pattern with perifollicular sparing. One possible explanation is a postinflammatory hyperpigmentation induced by the infiltrating lymphocytes. Copyright 2001 S. Karger AG, Basel This article was published in Dermatology and referenced in Dermatology and Dermatologic Diseases

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