White patches on the skin, also known as vitiligo is a skin disorder wherein the skin losses its usual pigmentation/ color. Though medically it is not a very serious disease, the social stigma which is attached to it makes vitiligo a matter of grave concern. This is especially so in case of brown and dark colored people. Not only does it affect their appearance, but also brings down the confidence level of the individual.

http://www.noblevitiligoclinic.com/white-patches-treatment/