Sun damage is one of the leading contributors to ageing skin.
Pigmentation is a natural process and usually develops in the form of age spots freckles or larger patches of discoloured skin.
Sun exposure is what triggers your body to produce melanin. Melanin is stimulated causing hyper-pigmentation condition to form on at the base of the epidermis and the top layer of the dermis.
Many factors contribute to the production of pigmentation, however exposure to sunlight, hormones and medications are usually the primary contributors.