Hyperpigmentation in black skin

特許 係属中 In dermatology, hyperpigmentation is the darkening of an area of skin or nails caused by increased melanin. Hyperpigmentation can be caused by sun damage, inflammation, or other skin injuries, including those related to acne vulgaris.[1] People with darker Asian, Mediterranean, or African skin tones are also more prone to hyperpigmentation, especially if they have excess sun exposure.