What does wheal refer to in dermatology?

• A. Solid lesion
• B. Fluid-filled blister
• C. Localized area of swelling
• D. Rash due to inflammation

Answer: (C)

Wheal refers to a localized area of swelling that typically occurs in the skin as a result of an allergic reaction or irritation. This swelling is often raised and can be itchy, resembling a bump on the surface of the skin. Wheals can vary in size and shape and are characterized by their transitory nature, meaning they can appear and disappear relatively quickly.

In contrast, a solid lesion describes a mass that is firm and does not contain fluid. A fluid-filled blister refers to a vesicle that contains clear fluid, which is distinct from the raised swelling of a wheal. A rash due to inflammation encompasses a broader range of skin changes, including redness and various types of lesions, but it is not specifically defined as the localized, raised swelling that characterizes a wheal. Thus, the correct understanding of wheal aligns with the definition of localized areas of swelling that are often seen in dermatological assessments.