Final answer:
Wheals are transient, elevated, and irregularly shaped lesions that result from an allergic skin eruption called urticaria.
Step-by-step explanation:
Transient, elevated, and irregularly shaped lesions called wheals result from an allergic skin eruption called urticaria. These wheals are characterized by their inflammatory response and are caused by the release of histamine and granule mediators in response to allergens in type I hypersensitivity reactions. The wheals are typically transient, meaning they come and go within a short period of time, and can vary in size and shape.