**Core Concept**
Urticarial lesions, also known as hives, are a type of skin manifestation characterized by raised, itchy, and well-demarcated wheals. They are a common symptom of allergic reactions, infections, and other medical conditions. The pathophysiology of urticarial lesions involves the release of histamine and other chemical mediators from mast cells, leading to increased vascular permeability and smooth muscle contraction.

**Why the Correct Answer is Right**
The correct answer describes urticarial lesions as "raised, itchy, and well-demarcated wheals." This is a precise clinical description of the lesions. The release of histamine from mast cells causes vasodilation and increased vascular permeability, leading to the characteristic raised appearance of the lesions. The itching sensation is due to the release of histamine and other chemical mediators, which stimulate nerve endings in the skin.

**Why Each Wrong Option is Incorrect**
**Option B:** This option may be a distractor because it describes a different type of skin lesion, such as a blister or a bulla. While blisters and bullae can be itchy, they do not have the same characteristic raised, well-demarcated appearance as urticarial lesions.
**Option C:** This option may be a distractor because it describes a type of skin lesion that is not typically itchy, such as a seborrheic keratosis. While some skin lesions can be itchy, the characteristic itching sensation of urticarial lesions is a key feature that distinguishes them from other types of skin lesions.

**Clinical Pearl / High-Yield Fact**
Urticarial lesions can be a sign of an underlying systemic illness, such as an allergic reaction, infection, or autoimmune disorder. In addition to their characteristic raised, itchy appearance, urticarial lesions can also be accompanied by other symptoms such as fever, joint pain, and gastrointestinal distress.

**Correct Answer:** D. Raised, itchy, and well-demarcated wheals.