The types of reactions to ultraviolet light are varied. In many disorders, ultraviolet light aggravates, but does not cause, the disease. Examples of this type of reaction include lupus erythematosus, porphyria cutanea tarda, dermatitis associated with niacin deficiency (pellagra), and recurrence of HSV. Other disorders are caused primarily by the sun. The most common is a sunburn reaction. Sunburn reaction, exogenously induced photosensitivity, and polymorphous light eruption are discussed here.
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