melanin skin tone color palette scheme

skin pigmentation melanin fitzpatrick classification palette scheme scale tone pigment phototype complexion epidermis melanocyte keratinocyte anatomy hair eye dermis dark light olive hyperpigmentation vitiligo black health medicine body diversity comparison freckles human people brown illustration eumelanin pheomelanin dermatology cosmetology skincare melasma africanamerican asian caucasian hispanic background diagram vector infographic