Which type of lesions are commonly caused by urticarial reactions?

Urticarial reactions, commonly known as hives, are characterized by raised, itchy areas of skin, which are referred to as wheals. These wheals are typically transient and can vary in size and shape, often appearing suddenly due to the release of histamines in response to allergens or irritants. The wheals are usually red or skin-colored and may be surrounded by areas of redness.

The correct answer highlights the specific nature of the lesions associated with urticarial reactions. While bumps, blisters, and scrapes can occur in different skin conditions, they do not specifically denote the type of reaction that arises from urticarial responses. Wheals are distinct due to their formation process linked to allergic reactions, making this the accurate choice for describing the lesions caused by urticaria.