Solar urticaria treatment by inducing tolerance to artificial radiation and natural light

Abstract

Solar urticaria was treated by means of repeated exposures of the skin to fluorescent lamps or natural sunlight. Repeated exposures over a period of hours induced a state of tolerance in [human] skin so that urticaria failed to develop. The state of tolerance could be maintained with regular daily exposures, and treatment could lead to complete symptomatic relief. Determination of the action spectrum for urticaria was advisable in order to choose the correct fluorescent lamp for treatment.