In the last few years, many papers of both a basic and clinical nature have been written regarding the effects of light on the skin. It has become necessary to have some understanding of the physical concepts involved in these light reactions. This paper is concerned with the immediate effects of light and will not cover the ultimate biological reactions. Light is absorbed by certain molecules in the skin. In the process, these molecules become excited, are highly reactive, and are capable of entering into reactions. These photochemical reactions can result in the damage of a biologic material such as protein and nucleic acid.
NORINS AL. The Immediate Effects of Light On the Skin. Arch Dermatol. 1964;90(5):518–525. doi:10.1001/archderm.1964.01600050066013
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