This entity of eczematization of the centrally located nevi/lesion is called as Meyerson phenomenon (halo dermatitis) (4-6).
Both lesions were diagnosed as eczematous lentiginous nevus with Meyerson phenomenon (Meyerson nevus).
Meyerson phenomenon in children: observation in five cases of congenital melanocytic nevi.
We diagnosed Meyerson phenomenon within her PWS and prescribed a mild topical corticosteroid (alclometa sone) ointment for 2 weeks.
Our two patients differ in possible contribution of laser treatment to the development of Meyerson phenomenon within their PWS: although initial laser treatment lightened the nevi in both, in the first case laser-induced inflammation completely subsided over a 2-month period prior to the appearance of dermatitis.
The cause of Meyerson phenomenon in PWS is not known despite several hypotheses, including a proinflammatory environment in the setting of ectatic postcapillary vessels (2, 5, 7) or possible genetic mosaicism underlying nevi (5).