Hyperpigmentation is a term used by dermatologists to describe areas of the skin that appear darker in color. Patches of darker skin can appear in all shapes and sizes, and it may cover large areas of the body. Hyperpigmentation occurs when the skin produces more melanin in certain areas, causing the appearance of darker patches of skin. As we age, it is normal to develop sunspots or darker areas of skin, especially in areas that have been exposed to the sun. Hyperpigmentation by itself is not harmful; however, it may be caused by other health conditions or may be a symptom of another disease.