In technical terms, sunburn is an acute cutaneous inflammatory reaction that occurs usually between 1–24 hr after sun exposure.1, 2 The severity of the sunburn depends on two variables: the intensity or dose of light, and the length of exposure to the ultraviolet radiation (UVR). This reaction is characterized by different degrees of erythema frequently associated with pain, swelling and even the presence of blisters.2–4 Furthermore, exposure to excessive doses of solar radiation induces both acute and chronic damage to skin. However, these effects can be blocked by both UVA and UVB sunscreens. The present article therefore reviews mechanisms of UVR insult to the skin and provides sunscreen formulation suggestions for the development of sunscreen products to protect against this damage.
Developing Sunscreens for the Preventive Treatment of Photodamage and Premature Aging
May 7th, 2013