Solar urticaria. Determinations of action and inhibition spectra

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Abstract
A 42-yr-old woman acquired solar urticaria .apprx. 10 min after exposure to sunlight. Urticaria developed from visible light emitted from a projector lamp after a similar time lag. Monochromatic rays, 400-500 nm, induced immediate urticaria by irradiation, with 4 times the minimal urticarial dose. Urticaria that was induced by monochromatic rays or the projector lamp was completely inhibited by immediate reirradiation of test sites with light waves longer than 530 nm. Radiant heat exposure from an electric hair dryer at 50.degree. C had no suppressive effects on the development of urticarial lesions.