― The medical term for white spots on skin is vitiligo or leucoderma. It's a skin disease in which the skin loses its color due to some genetic or environmental causes. The white spots appear as patches of white skin without pigment. ∙ White spots on skin are common in people who suffer from autoimmune diseases. One of these diseases is adrenocortical insufficiency. The adrenal gland is responsible for producing a hormone called corticosteroid. This disease occurs when there is a deficiency [...].