Delayed-onset Solar Urticaria Coexisting With Spontaneous Chronic Urticaria and Polymorphic Light Eruption

solar coexistente con urticaria crónica espontánea y erupción polimorfa lumínica Dear Editor:Solar urticaria (SU) is characterized by an immediate onset of erythema and itchy wheals within 5---10 min of exposure to solar radiation, which disappear in a few hours.1,2 Very uncommon isolated cases of delayed-onset SU have been described, in which the lesions appear several hours after sun exposure and may last up to 24 h.3---7 Case report A 58-year-old woman, with a personal history of asthma and allergic rhinitis, was referred to our dermatology department due to the appearance of delayed outbreaks of itchy wheals in photoexposed areas throughout the previous 8 years.The lesions appeared within 2---3 h after sun exposure and faded after 24---48 h.In addition, by the same time, she also had spontaneous outbreaks of wheals in any location unrelated to any activity or triggering physical factors.

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