Halo eczema around melanocytic nevi.

Nine patients developed multiple areas of eczema surrounding centrally located pigmented nevi. There was no significant history of atopy or evidence of external contact factors to account for the reaction. The eczema did not appear to influence the central melanocytic nevi, which persisted after resolution of the inflammation. The pathogenesis of this striking phenomenon remains unclear but differs from that associated with classical halo nevi.