skin tone pigmentation mechanism in light and dark skin

skin pigmentation melanin complexion epidermis phototype melanocyte keratinocyte melanosome anatomy tone pigment hair dermis dark light olive hyperpigmentation vitiligo black cell health medicine body human people brown illustration eumelanin pheomelanin treatment dermatology cosmetology skincare melasma africanamerican asian caucasian hispanic background structure tissue basal diagram crosssection vector infographic process