Definition: Excessive pigmentation of the skin, usually as a result of increased epidermal or dermal melanin pigmentation, hypermelanosis. Hyperpigmentation can be localized or generalized. The condition may arise from exposure to light, chemicals or other substances, or from a primary metabolic imbalance.
Synonyms (terms occurring on more labels are shown first): hyperpigmentation, skin hyperpigmentation, hyper pigmentation, hyper- pigmentation, Skin hyper-pigmentation, hyper-pigmentation, Skin hyper- pigmentation, hyperpigmentation of skin, skin hyper pigmentation, hyperpigmen tation
More information: PubMed search and possibly Wikipedia