See photosensitization.
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pho·to·al·ler·gy (fo″to-alґər-je) [photo- + allergy] a delayed immunologic type of photosensitivity occurring upon exposure to a given chemical substance to which the individual has become previously sensitized. See also photoallergic contact dermatitis, under dermatitis. Cf. phototoxicity. photoallergic adjMedical dictionary. 2011.