Which of the following is a definition of a papule?

A papule is defined as a small, solid skin elevation that typically measures less than 1 centimeter in diameter. These lesions are characterized by their raised nature, resulting from a variety of factors, including inflammation or irritation within the skin. Papules can occur in different colors, ranging from flesh-toned to red, and they may vary in appearance based on their cause, such as acne, eczema, or other dermatological conditions.

The other definitions do not accurately describe a papule. An abnormal mass varying in size and shape could refer to several different types of skin lesions, making it too broad. A cyst containing morbid matter refers to a specific type of lesion that is usually larger and filled with fluid or semi-solid material, which does not fit the description of a papule. Similarly, a raised spot containing pus describes a pustule, which is distinct from a papule since it involves pus rather than just a solid elevation. Therefore, the definition of a papule as a small, solid skin elevation is precise and aligns with standard dermatological terminology.