vitiligo causes
Vitiligo: A Common Cause of Loss of Skin Pigment. Melanin is the pigment that gives the skin its characteristic color. Vitiligo is caused by a loss of pigment in the skin, due to destruction of pigment-forming cells known as melanocytes. Although vitiligo affects all races equally, it is more noticeable in dark-skinned people. Vitiligo can cause cosmetic problems.
The rate at which melanin granules are formed in these cells and their concentration in the epidermis are inherited characteristics and major factors in skin color differences. When no melanin is produced, the involved patch of skin becomes white. When a white patch grows or spreads, the cause may be vitiligo.