What term describes a circumscribed, flat, nonpalpable change in skin color?

The term that describes a circumscribed, flat, nonpalpable change in skin color is a macule. Macules are characterized by their flat appearance and typically differ in color from the surrounding skin. They can be various sizes and are often used to describe skin conditions or lesions that are visually distinct yet do not protrude above the surface of the skin.

In dermatology, recognizing the distinct features of skin changes is crucial for diagnosis. Macules are often associated with conditions such as freckles, which are small macules, or other pigmentary changes like those seen in specific dermatological diseases. This definition differentiates macules from other skin lesions that might be raised, fluid-filled, or involve a significant change in texture, which do not fit the criteria of a macule.