Solar urticaria

Solar urticaria is a relatively rare immunoglobulin E–mediated photodermatosis that is caused by specific, yet diverse wavelengths of light. The history, epidemiology, clinical manifestations, histology, etiology/pathogenesis, differential diagnosis, treatment, course, and prognosis of solar urticaria are reviewed herein.Learning objectiveAfter completing this learning activity, participants should be able to describe the clinical manifestations of solar urticaria, summarize the proposed mechanisms of pathogenesis, and discuss the management options of solar urticaria.