Overview of sunlight and skin damage

[Britney]

Sunlight stimulates vitamin D production, helps control some chronic skin diseases (such as psoriasis), and causes a sense of well-being. However, sunlight can cause skin damage.
Damage includes not only a painful sunburn but also wrinkling and other changes associated with aging skin (photoaging), actinic keratoses, skin cancers, and even allergic reactions and worsening of some skin diseases (see Photosensitivity Reactions).