Hyperpigmentation of skin (Melanosis): It is excessive amounts of melanin in the epidermis and in the dermal melanophages. Hyperpigmentation may be focal or diffuse and confined to the basal cell layer or present throughout all epidermal layers.
Hypopigmentation: It is decreased amounts of melanin in the epidermis. It may be associated with congenital or acquired idiopathic defects in melaninization.
It is either: A-Leukoderma
B-Vitiligo
Leukoderma: It is a condition in which some patches of the skin lose its melanin and appeared white in color.