URTICARIA SOLARIS

Abstract
Urticarial wheals produced by exposure to sunlight have been reported rather infrequently in the literature, abundant though it is on subjects dealing with physical allergy and with photosensitization. Moreover, adequate attempts to define the responsible portion or portions of the spectrum have been made in only a few of the reported cases. These facts seem to justify a brief survey of available literature and the report of a case of urticaria caused by sunlight. The comparative rarity of urticaria solaris is attested by the brevity with which it is treated in textbooks. In the 1910 edition of Stelwagon's textbook1 there is no mention of it. Ormsby,2 in 1937, remarked that it had been observed. Andrews,3 in 1938, briefly referred to the case described by Duke4 in 1923. Jadassohn,5 in 1938, stated briefly that "urticaria solaris ('photogenica')" appears to be produced by radiation in the "longer

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