ABSTRACT
INTRODUCTION Skin aging is a complex process determined by genetic factors (intrinsic aging) and cumulative exposure to external factors such as ultraviolet radiation (UVR), smoking, and particle pollution (extrinsic aging) [1-4]. The ne wrinkles and reduced elasticity, which characterize intrinsically aged skin, are exaggerated in photoaged skin, where exposure to UVR is associated with the development of both deep wrinkles and a marked loss of elasticity. Photoaging, like chronological aging, is a cumulative process that depends primarily on the degree of sun exposure and skin pigment. Individuals who have outdoor lifestyles, live in sunny climates, and are lightly pigmented will experience the greatest degree of photoaging [5].
