Dry skin is a result of lack of natural sebum (oil) production. Skin can feel rough and tight due to an unhealthy skin barrier, which means individuals with naturally dry skin need extra care to help stimulate oil production. The goal with this skin type is to use products that stimulate oil production and are occlusive, which helps repair and strengthen the skin's barrier.
Sun damage is caused by too much exposure to the sun's harmful rays. Primary effects are fine lines and wrinkles, loss of collagen and elastin, and hyperpigmentation. The goal with this skin type is to use products that are reparative and protective, such as Vitamin C to repair skin and sun screen to prevent future damage.