Photo-ageing is the damage caused to the skin by years of exposition to the sun. The dermis, one of the skin’s layers, has collagen, elastin and other fibres that make the skin look smooth. These elements are the ones damaged by ultraviolet radiation (UVR). The UVR are made of UVA and UVB rays, the former being the ones responsible for the damages associated to photo-ageing. UVA rays penetrate the dermis and break down the collagen, creating wrinkles and making the skin look older.

The constant exposition to the sun also causes spots, that appear in hands, arms and in the face. The best way of preventing photo-ageing is to apply sun cream in vulnerable areas. Furthermore, reducing the exposition to the UV radiation lessens the risk of developing skin cancer. When the skin is already severely damaged, there are several treatments available to reduce the ageing signs, like light therapy.