This document discusses various skin conditions related to sun exposure, both acute and chronic. It describes acute sunburn as an inflammatory response to UVB radiation, causing pain, tenderness and erythema. Prolonged sun exposure can lead to chronic conditions like dermatoheliosis or photoaging, characterized by a leathery, wrinkled appearance. Other chronic effects include solar lentigos or age spots, and certain metabolic disorders like porphyria cutanea tarda can be aggravated by sun exposure, presenting as fragile skin in exposed areas. Both topical treatments and lifestyle modifications are used to manage the effects of sun damage on the skin.