10 Causes of Urticaria
Cause #6: Exposure to Sun
In some people, simple exposure to the sun may be enough to trigger a break out of hives. This condition, which is referred to as solar urticaria, is quite rare. Patients who struggle with the condition have an extreme sensitivity to ultraviolet radiation and, in some cases, can be so sensitive that visible light causes them to experience a break out in hives.
The hives can target any part of their body, regardless of whether it came into contact with the light, even if the area is covered by clothing or another article.
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