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September 1974

Solar- vs Heat-Induced Urticaria

Author Affiliations

Atlanta; San Francisco

From the Department of Dermatology, Emory University School of Medicine, Atlanta (Dr. Willis), and the Department of Dermatology, University of California Medical Center, San Francisco (Dr. Epstein).

Arch Dermatol. 1974;110(3):389-392. doi:10.1001/archderm.1974.01630090027006

Observations of phototest and heat test responses in patients with visible light-induced solar urticaria revealed a type of urticaria that was either a new type or a variant of previously described type 3. In this variant, urticarial responses in the patient were easily elicited by full-spectrum visible light exposure, but not as expected by monochromatic light exposures within the same wavelength range. Surprisingly, urticaria was readily elicited in the patient with the variant type by exposure to radiant heat.

Exacerbations in both the variant and the usual type 3 case were easily controlled by intermittent low-dose systemic chloroquine therapy.

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