Uneven skin tone is a general term that is normally used to refer to any kind of superficial skin imperfection such as localized discoloration, blemishes, superficial spots, redness or pigmentation disorders. Probably the most widely understood interpretation of blemished skin is the formation of brown spots (hyper pigmentation), often as a result of hormonal fluctuations brought about by pregnancy or oral contraceptives, as well as (or in combination with) exposure to the sun.