What is Epidermal Naevus?
What is an epidermal naevus ? An epidermal naevus is due to an overgrowth of the epidermis . Lesions are present at birth or develop during childhood . The abnormality arises from a defect in the ectoderm, the outer layer of the embryo that gives rises to epidermis and neural tissues . An epidermal nervus is an abnormal , noncancerous patch of skin caused by an overgrowth of cells in the outermost layer of skin . Epidermal nevi are typically seen at birth or develop in early childhood . the epidermal is composed primarily of a specific cell type called a keratinocyte . the lines of Blaschko , which are normally invisible on skin develops before birth . Keratinocytic epidermal nevi are also known as linear epidermal nevi or verrucous epidermal nevi , based on characteristics of their appearance . There are several types of epidermal nervus that are defined in part by the type of epidermal cell involved . ...