Hyperpigmentation occurs when patches of skin become discoloured and become darker than the rest of your complexion. The pigment which gives skin its colour is called Melanin. This can make spots or patches of skin appear darker than surrounding areas. Hyperpigmentation is a common skin condition. It affects people of all skin types. Some forms of hyperpigmentation, including melasma and sun spots, are more likely to affect areas of skin that face sun exposure.Other types of hyperpigmentation happen after skin injury or skin inflammation, such as cuts, burns and acne.