Imagine waking up to a map of red, itchy welts across your arms. By lunchtime, they’ve vanished from your arms only to reappear on your legs, stinging and burning like a fresh brush with a nettle. You ...

Hives, or urticaria, can occur for many reasons, such as exposure to an allergen or a physical trigger, like pressure from tight clothing. It may also indicate an infection or another underlying ...