What term describes a small, elevated area of the skin filled with pus or lymph?

The term that accurately describes a small, elevated area of the skin filled with pus or lymph is a pustule. Pustules are typically defined as inflammatory lesions that contain purulent material, which gives them a characteristic appearance. They are often associated with conditions such as acne or infections and are generally characterized by a red base with a white or yellowish center due to the accumulation of pus.

In contrast, a blister refers to a fluid-filled sac that is typically clear fluid rather than pus, and it usually occurs due to friction or burns. A vesicle is similar to a blister but is smaller and also contains clear fluid. An abscess, while also a collection of pus, is usually larger and can be deeper within the tissue rather than being a small, elevated area on the skin's surface. Thus, pustule is the most accurate term for the description provided.