Urticaria is the medical name for hives. Urticaria are an outbreak of swollen, pale red bumps, patches, or welts on the skin that appear suddenly. Hives are commonly the result of allergies. Urticaria usually cause itching, burning, and stinging. Hives can appear anywhere on the body, including the face, lips, tongue, throat, or ears. Angioedema is similar to hives, but the swelling occurs beneath the skin instead of on the surface. Angioedema is characterized by deep swelling around the eyes and lips and sometimes the genitals, hands, and feet.