Solar urticaria. Clinical features and wavelength dependence

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Abstract
Solar urticaria, an uncommon photosensitivity disorder, may be disabling for affected patients, especially those who react after short exposures to artificial or natural light. The spectrodermograph, a newly developed instrument, permits rapid, accurate determination of the action spectrum of solar urticaria. It consists of a xenon arc lamp with an emission dispersed into narrow wavelength bands from 250-610 nm. This instrument was used to establish the wavelengths responsible for solar urticaria in 12 patients during the past 4 yr. Knowledge of the wavelengths responsible for producing the urticarial reaction has implications for selecting appropriate therapy. The clinical course of these patients is also reviewed.

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