What are swollen, itchy bumps on the skin that last for several hours called?

The term that accurately describes swollen, itchy bumps on the skin lasting for several hours is 'hives.' Hives, also known as urticaria, are raised, red welts that can vary in size and shape. They are often the result of an allergic reaction or other triggers, such as certain foods, medications, or insect stings. Hives can appear suddenly and may resolve quickly, often disappearing within a few hours.

While 'wheals' is synonymous with hives, it is more of a generalized term used in dermatology that refers specifically to the physical characteristics of these raised areas on the skin. Therefore, 'hives' is the more common and appropriate term used in everyday language.

In contrast, blisters are fluid-filled sacs that typically arise from friction or burns, and rashes refer to broader skin reactions, which can include a variety of conditions resulting in inflamed skin rather than specifically raised bumps.