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Solar urticaria is a quite rare form of hives that is triggered by sun exposure. Sun exposure produces typical whealing, redness and itching of hives within a couple of minutes of sun exposure. The condition tends to disappear spontaneously within a few years.
Solar urticaria is a different condition than photodermatitis, which is a reaction within the skin to ultraviolet radiation and other factors such as medications, plant materials, or certain illnesses such as lupus.