Chronic idiopathic urticaria is often triggered by physical changes, such as exposure to certain allergens or developing an infection. For some, triggers are mental or psychological, like stress and ...

Hives are a skin reaction of itchy bumps that may burn or sting. They can develop not only from an immune response to an allergen but also to heat. While you may think of hives or urticaria as ...

Hives can occur anywhere on the body. However, exposed skin, such as arms and legs, may be more susceptible to external hives triggers such as allergens, heat, and pressure changes. Other common ...