Recurrent eczema on congenital melanocytic nevus (Meyerson nevus).

Abstract

Meyerson nevus (3) consists of a transient, superficial, inflammatory, clinically evident reaction, that is superimposed to a melanocytic nevus, often concentrically. This inflammatory lesion should be differentiated both from the autoimmune inflammation of halo nevus, which is more or less clinically visible, and from the so-called Meyerson phenomenon (2), namely the deterioration of dermatitis superimposed to angiomatous lesions of mid-line angioma type. The inflammatory reaction can affect congenital and acquired of various type melanocytic nevi and also other cutaneous tumors such as for instance histiocytoma (1). The inflammatory reaction surrounding the nevus can occur during widespread dermatitis -atopic dermatitis, pityriasis rosea, psoriasis- or, as in our case, be a single isolated focus.