Urticaria, or hives, is a condition in which red, itchy, and swollen raised areas appear on the skin-usually as an allergic reaction from eating certain foods or taking certain medicines however, sometimes the cause may be unknown. Hives can vary in size from one-half inch to several inches in size. Hives can appear all over the body or be limited to one part of the body.
Angioedema is an allergic reaction that causes swelling deeper in the layers of the skin. It most commonly occurs on the hands, feet, and face (lips, tongue, and eyes).
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