What is the term for a small, firm, elevated lesion?

The term for a small, firm, elevated lesion is "papule." Papules are typically less than 1 centimeter in diameter and are solid in nature, meaning they do not contain fluid. Their raised structure is a result of an increase in the thickness of the skin or an inflammatory response, and they can vary in color. This characteristic distinguishes papules from other types of lesions. For instance, vesicles are small fluid-filled blisters, while pustules are similar but contain pus. Nodules, on the other hand, are larger (over 1 centimeter) and extend deeper into the skin than papules. Understanding these definitions and differentiating characteristics is essential in clinical practice for accurate diagnosis and treatment.