skin disorders
Photosensitivity Reactions
Introduction
Photosensitivity, sometimes referred to as a sun allergy, is an immune system reaction that is triggered by sunlight. Sunlight can trigger immune system reactions. People develop itchy eruptions or areas of redness and inflammation on patches of sun-exposed skin. The diagnosis is usually based on a doctor's evaluation. These reactions typically resolve without treatment. (See also Overview of Sunlight and Skin Damage .) Photosensitivity reactions include solar urticaria, chemical photosensitization, and polymorphous light eruption and are usually characterized by an itchy eruption on patches of sun-exposed skin. People may inherit a tendency to develop these reactions. Certain diseases, such as Systemic Lupus Erythematosus (SLE) and some 