What characterizes a wheal lesion?

A wheal lesion is characterized primarily by a raised area on the skin that is often swollen and may vary in color. Typically, these lesions are a result of an allergic reaction, insect bites, or other irritants and present as raised bumps that can be itchy and red, indicating localized inflammation. The raised nature of the lesion distinguishes it from other types of skin lesions, which might have different characteristics such as crusting or scaling.

In contrast, crust formation indicates a different type of skin lesion where a scab or dried exudate forms on the skin, while a depressed area signifies atrophy or loss of surface tissue. Scaly patches, on the other hand, suggest a different inflammatory or dermatological condition where there is a flaky buildup of skin cells. Thus, the unique presentation of a wheal as a raised, often itchy area makes it distinct and is the reason why this specific description is the accurate choice.