Which term describes a smooth swollen area that is usually accompained by itching?

The term that describes a smooth swollen area, often accompanied by itching, is "urticaria," commonly known as hives. Urticaria is characterized by raised welts on the skin that may vary in size and can appear suddenly. It is typically caused by allergic reactions, stress, or other triggers. Treatment often involves antihistamines to relieve itching and swelling.