title: Photoallergy.
abstract: Many--topically applied or systemically administered--substances may trigger photoallergic skin reactions following exposure to ultraviolet (UV) radiation. While most cases represent photoallergic contact dermatitis due to topically applied agents, systemically triggered photoallergy is considerably less common. The photopatch test--a UV-exposed variant of the conventional patch test--is the mainstay in the diagnosis of photoallergic or phototoxic reactions.
authors: Department of Dermatology, University of Regensburg, Germany.
authors: Anna
authors: A
authors: Wilm
authors: Mark
authors: M
authors: Berneburg
mesh_terms: D000287:Administration, Topical; D000305:Adrenal Cortex Hormones / Q000008:administration & dosage; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000008:administration & dosage; D017454:Dermatitis, Photoallergic / Q000175:diagnosis* / Q000188:drug therapy*; D019317:Evidence-Based Medicine; D006633:Histamine Antagonists / Q000008:administration & dosage; D006801:Humans; D017319:Photosensitizing Agents / Q000009:adverse effects*; D016896:Treatment Outcome; D014466:Ultraviolet Rays / Q000009:adverse effects
chemical_list: D000305:Adrenal Cortex Hormones; D000894:Anti-Inflammatory Agents, Non-Steroidal; D006633:Histamine Antagonists; D017319:Photosensitizing Agents