incontinence of pigment

in·con·ti·nence of pig·ment

loss of melanin from the epidermis, and accumulation in melanophages in the upper dermis; seen in several inflammatory diseases of the skin and in incontinentia pigmenti.
References in periodicals archive ?
Histologically, there is flattened epidermis with isolated necrosis of keratinocytes and micrscopic areas of the cleavage of the dermo-epidermal junction which lead to incontinence of pigment in the form of free melanin in the dermis or within the dermal macrophages.
This is due to incontinence of pigment," he explained.