The Halo Nevus

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Abstract
The halo nevus can be defined as a pigmented nevus with an obvious depigmented zone about it. Recent observations have indicated that these lesions will undergo self-involution. This article presents the variety of histopathologic pictures seen and demonstrates the gross clinical changes that can occur in the nevus (change in color, increase in size, scaling, and crusting) during this process of self destruction. The association of these clinical and pathologic changes might make one consider the diagnosis of malignant melanoma. The benign significance of these changes in a halo nevus is stressed. In addition, other aspects of halo nevi such as distribution, configuration, multiplicity, association with vitiligo, and the fate of the halo are presented.

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