Final answer:
The condition with wheals and large edematous areas in the dermis and subcutaneous tissue is drug induced acute urticaria, an allergic reaction identified by a wheal and flare response in skin testing.
Step-by-step explanation:
The condition characterized by wheals and large edematous areas that involve the dermis and subcutaneous tissue is drug induced acute urticaria. Urticaria, commonly known as hives, is an allergic reaction that can be triggered by various substances, including drugs. These reactions typically cause pale red swellings known as wheals or welts to appear on the skin, along with larger swollen areas, which are the result of fluid leakage from blood vessels. Histamine and other mediators released during the allergic response cause the blood vessels to dilate, leading to the visible symptoms associated with urticaria. The allergens in an allergic reaction can be identified by allergists using skin testing, which looks for the wheal and flare response indicative of type I hypersensitivity.
The condition characterized by wheals and large edematous areas that involve the dermis and subcutaneous tissue is drug induced acute urticaria. Urticaria, also known as hives, is a skin rash that is typically characterized by elevated, itchy wheals surrounded by redness. In case of drug-induced acute urticaria, the rash is caused by a hypersensitivity reaction to a medication or drug.