Which condition is marked by severe itching followed by redness and swelling?

Urticaria, commonly known as hives, is characterized by the presence of red, itchy welts on the skin. The intense itching is often accompanied by swelling, which occurs due to the release of histamines and other inflammatory substances in response to an allergen or irritant. In urticaria, the welts can vary in size and may appear and disappear quickly, which is a distinguishing feature of the condition. The inflammatory response leads to the dilation of blood vessels, resulting in redness and localized swelling.

This process can be triggered by various factors, including allergens, medications, temperature changes, or stress. Understanding urticaria is essential in differentiating it from other skin conditions, where the pattern of itching, redness, and swelling may present differently or be accompanied by other symptoms.