cross section of freckles and melasma on skin layer on white background.

freckles melasma skin pigmentation hyperpigmentation face melanin melanocyte small flat spots patches comparison cross body sun exposed ephelides solar lentigines actinic discoloration complexion disorder genetic dark brown melanogenesis pigment hormone layer cell epidermis dermis sunburn exposure vector infographic design diagram inflammation unhealthy dermatology beauty treatment care damage lesion change ultraviolet light childhood summer aesthetic 202408cross isolated white background blue gray font pink line text brand pattern purple circle advertising organ presentation petal magenta violet art label logo