Which of the following is characterized as swelling of the lips?

Angioedema is characterized as swelling of the lips and other areas of the body, typically due to a localized reaction that affects the deeper layers of the skin. This condition often manifests as rapid swelling beneath the skin's surface and can occur in various parts of the body, including the face, throat, and extremities. Angioedema is commonly associated with allergic reactions, though it can also stem from other causes, such as certain medications or hereditary factors.

In contrast, urticaria, commonly known as hives, presents with raised, itchy welts on the skin's surface, but it does not specifically involve swelling the deeper tissues, such as the lips. Erythema refers to redness of the skin caused by increased blood flow, typically associated with inflammation or irritation, rather than the swelling characteristic of angioedema. Dermatitis, on the other hand, is a term for inflammation of the skin that can cause various symptoms, including redness, itching, and sometimes blistering, but it does not specifically describe swelling of the lips in the same manner as angioedema.