Which skin condition is characterized by intense itching and an acute allergic reaction?

The skin condition characterized by intense itching and an acute allergic reaction is urticaria, commonly known as hives. This condition results from the release of histamines in response to allergens, leading to the appearance of raised, itchy welts on the skin. The itching is often severe and can be accompanied by redness and swelling. Urticaria can develop quickly, often as a response to factors like foods, medications, or insect stings, making it an acute allergic reaction.

In contrast, xanthomas pertain to fat deposits in the skin and are not directly linked to allergies or itching. Blisters are fluid-filled sacs that typically arise from friction, burns, or infections, rather than allergic reactions. Bed sores, or pressure ulcers, result from prolonged pressure on the skin and are not associated with allergies or acute itching. Therefore, urticaria is specifically recognized for its acute response in allergic reactions, which is why it is the correct answer.