What skin condition is characterized by wheals and can be triggered by allergic reactions?

Urticaria, commonly known as hives, is characterized by the appearance of wheals on the skin. Wheals are raised, often itchy areas that can vary in size and are typically the result of an allergic reaction. Urticaria occurs when histamines and other chemicals are released in the body in response to allergens, leading to localized swelling and inflammation of the skin.

This condition is distinct from the other options listed. For instance, psoriasis is a chronic autoimmune condition that leads to thick, scaly patches on the skin, while angioedema involves deeper swelling that often affects the face and airways, but is not characterized by wheals. Acne vulgaris is primarily associated with clogged pores and does not involve wheal formation. Understanding these differences is crucial in recognizing urticaria and its association with allergic reactions.