What describes a skin lesion that appears as small, pus-filled blisters?

The term that describes a skin lesion characterized by small, pus-filled blisters is a pustule. Pustules are small elevations of the skin that are filled with purulent material, which is typically a mix of white blood cells, dead skin cells, and bacteria, giving them a white or yellowish appearance. They are often associated with various skin conditions, including acne and infections.

In contrast, nodules are solid, raised lumps that can be found deeper in the skin, while warts are caused by viral infections and appear as raised, rough lesions on the skin surface. Cysts are closed sacs within or under the skin that can be filled with fluid, semi-solid material, or gas, but they do not typically present as pus-filled blisters. Thus, a pustule is the appropriate term for small, pus-filled blisters on the skin.