RT Book, Section A1 Maurer, Marcus A1 Fluhr, Joachim W. A1 Weller, Karsten A2 Kang, Sewon A2 Amagai, Masayuki A2 Bruckner, Anna L. A2 Enk, Alexander H. A2 Margolis, David J. A2 McMichael, Amy J. A2 Orringer, Jeffrey S. SR Print(0) ID 1161327318 T1 Solar Urticaria T2 Fitzpatrick's Dermatology, 9e YR 2019 FD 2019 PB McGraw-Hill Education PP New York, NY SN 9780071837798 LK accessmedicine.mhmedical.com/content.aspx?aid=1161327318 RD 2024/10/13 AB AT-A-GLANCEAn uncommon form of chronic inducible urticariaErythema and itchy wheals occur within minutes of sunlight exposure and resolve within hours.May be disabling and, rarely, life threatening.Phototesting confirms the diagnosis, determines the trigger threshold, and identifies the eliciting wave lengths.Sensitivity may be to ultraviolet B, ultraviolet A, visible light, and/or any combination, but most commonly to ultraviolet A and visible light.Sunlight avoidance, high–protection factor broad-spectrum sunscreens, and antihistamines may help.Omalizumab may be a helpful second-line treatmentPhototherapy may also help but is usually not feasible as long-term treatment