Photosensitivity is an abnormal skin response to ultraviolet radiation exposure (UV). This is a skin reaction to sunlight exposure involving the body’s defensive immune system. It can be idiopathic (of unknown origin) or may occur after exposure to certain chemical substances or drugs.
Itchy rashes and red, inflamed areas appear on the skin exposed to the sun. We are going to address two of the main, most frequent groups of photodermatosis: Photodermatosis following exposure to certain chemical products or drugs. Photoallergic rash. Involves the immune system. Requires prior sensitivity. Small substance doses and reduced solar radiation. Can extend to areas not exposed to the sun. Drugs to combat acne and certain antibiotics (quinolones, tetracyclines, etc.) are of note. Phototoxic rash. Does not involve immunity. Does not require prior sensitivity.
Requires greater doses of solar radiation and chemical products. Limited to areas exposed to the sun. Idiopathic photodermatosis. Caused or exacerbated by electromagnetic radiation (ultraviolet, infrared and visible light), especially ultraviolet (UVA). Polymorphic light eruption (reaction to light). This is the most frequent. Delayed appearance of symptoms after solar exposure. At any age, and especially in spring and early summer. Avoid sun exposure, especially during times of greatest intensity, and use sunscreens. Solar urticaria. This is infrequent, and quickly appears immediately after sun exposure. It is transitory in nature. The lesions are mainly located on the exposed areas, especially the neckline and arms, but it can also occasionally appear in covered areas, since radiation can penetrate clothing.
Dr. Juan Antonio Andreo Ramírez Director Médico de ASSSA ASSSA Medical Manager
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