The process of cell renewal and migration to the stratum corneum averages 4-5 weeks, as we age this process takes longer, look at a babies or childs beautiful peachy skin for the proof! As skin is exposed to excessive sun, the stratum corneum or the outermost layer responds by thickening inorder to protect the lower levels. that is why spf daily protection is essential suisse absolue offer a great spf 15 with tint, spf 30 and spf 50 which is easy and light on the skin, does not clog the pores.. treatments that acceralte collagen and helps to remove damage are dermal rollers, skin peels in conjunctions with suisse absolue serums and creams.