Your skin’s color comes from a pigment known as melanin. There are special cells in the skin that make melanin. However if these cells become unhealthy or damaged in some way, it can affect the production of melanin. As a result the skin can become a different shade or color entirely. Some pigmentation disorders affect just localized patches of skin.
The melanin is what determines the color of the skin and also helps to protect your skin from the sun.
The pigmentation damage or disorders that can lead to pigmentation (or changes in the color of the skin) can be brought about by an inflammatory problem or infection.
Mottled looking skin can be the result of changes to the blood vessels under the skin.
Pigmentation Disorders can be because of hereditary or genetic reasons, or caused by an injury, or simply due to changes in a person’s hormone levels.