Chronic urticaria is defined as wheals (hives), angioedema (swelling), or both that have been continuously or intermittently present for at least 6 weeks, 1,2 in contrast to acute urticaria, which is ...

Solar urticaria is a rare allergic reaction to sun exposure. The condition causes an itchy rash or hives that appear on any skin that has been exposed to the sun. The more skin that is exposed to ...

Hives are swollen, pale red bumps, patches, or welts on the skin that appear suddenly. On darker skin tones, they can appear skin-colored and can be more difficult to see. They can happen because of ...

Physical urticaria is a skin condition in which hives (urticaria) develop from direct contact with certain physical elements. Unlike contact or allergy-related hives, the stimuli that trigger physical ...

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 ...

Daniel More, MD, FAAAAI, FACAAI, FACP, is a board-certified allergist and former clinical immunologist at Allergy Partners of the Central California Coast. Hives are round, oval, or irregularly shaped ...

This Journal feature begins with a case vignette highlighting a common clinical problem. Evidence supporting various strategies is then presented, followed by a review of formal guidelines, when they ...