Which of the following terms refers to a raised, solid lesion that is generally less than 1 cm in diameter?

The term that describes a raised, solid lesion that is generally less than 1 cm in diameter is a papule. Papules are small, elevated bumps on the skin that can vary in color and texture but are typically firm to the touch. They are often seen in various dermatological conditions, such as acne or dermatitis, and are a significant feature in identifying skin disorders.

In contrast, exudate refers to fluid that leaks out of blood vessels into nearby tissues, often during inflammation, and does not denote a solid lesion. Keratolytic describes a chemical agent that helps to remove or break down the outer layer of skin, commonly used in treating conditions like psoriasis but not related to the definition of a lesion. Fissure indicates a linear crack or break in the skin or mucous membranes, which is also distinctly different from the characteristics of a papule.