melasma types. chloasma faciei. cross section of human skin with hyperpigmentation

melasma skin melanocyte beauty chloasma faciei treatment care pigment dermatology melanin spot dark young health problem damage freckle cross hyperpigmentation dermal epidermal mask pregnancy cosmetic pigmentation dry sensitive cosmetology medical closeup age sunburn sunscreen adult freckles removal cream makeup medicine beautiful aging whitening acne mark sun exposure uv radiation hormones estrogen genetic discoloration diagnosis peels therapy