Pigmentary Mosaicism in Two Infants: Phylloid Hypermelanosis and Linear and Whorled Nevoid Hyperpigmentation

Abstract

Pigmentary mosaicism is a term used to describe
irregular or variegate hyper or hypopigmentation of
the skin, due to the genetic heterogeneity of the cells
that compose the skin. The more common variant is
the hypomelanosis variant with the well-described
prototype being hypomelanosis of Ito.
The true incidence is unknown; however, there are
several case reports of the condition in the literature,
many of which are associated with extracutaneous
manifestations. We report two cases of congenital
disorder of skin pigmentation in two male patients
seen by the paediatric dermatology unit of the
University of Ilorin Teaching Hospital.