Changes occur to skin from chronic exposure to UV radiation (different from age related changes to skin). Histological changes vary from benign hyperplasia to epidermal dysplasia; white elastic fibres thicken and increase in number; collagen is degraded and damaged by long term exposure. The process is initial characterised by an accumulation of abnormal tissue progresses to atrophic state in the elderly.
Wrinkling and roughness of skin; irregular mottled pigmentation (from melanocytic hyperplasia); brown macules; telangiectases
If more severe red dysplastic areas of actinic keratoses (greater risk of neoplasia)
Photodamage is cumulative prevention starts at young age.
Older persons who have taken preventative measures younger generally look younger than their chronological age.
4-6 months of topical tretinoin helps.