Which term indicates the presence of a solid, circumscribed lesion on the skin?

The term that indicates the presence of a solid, circumscribed lesion on the skin is indeed a papule. Papules are typically small, raised, and usually measure less than one centimeter in diameter. They can be differentiated from other skin lesions by their solid nature and well-defined borders, indicating that they are more elevated compared to the surrounding skin.

In contrast, a macule refers to a flat, discolored area of skin that is not elevated, making it distinct from papules. Urticaria, commonly known as hives, is characterized by itchy, swollen welts and does not indicate a solid lesion. Wheals are similar to urticaria and are transient, raised bumps that are typically itchy and associated with allergic reactions. Thus, the definition of a papule aligns perfectly with the description of a solid, circumscribed lesion, confirming its correctness as the appropriate term for this question.