mechanism of skin cell turnover . melanin and melanocytes in human skin layer with woman face. beauty and skin care

antiaging blemishes blotch bodypart cell cellturnover complexion damage darkspots dermatology dermis dullness epidermis exposure face female function healthcare human layer melanin melanocytes pigmentation rays skin skinbrightening skincare skincell spots sun sunbeam sunburn sunlight sunrays ultraviolet woman youngadult