Final answer:
A lesion with purulent content is described as a pustule, which is an elevated, pus-filled skin lesion commonly seen in infections like impetigo.
Step-by-step explanation:
The description of a lesion with purulent content is best characterized as a pustule. A pustule is a small, elevated lesion of the skin that is typically filled with pus, a yellowish fluid composed of white blood cells, dead tissue, and bacteria. This type of lesion is suppurative, meaning it produces or contains pus. In conditions such as impetigo, one may observe the presence of pustules alongside vesicles and bullae, particularly around areas such as the nose and mouth. When pustules rupture, they can become encrusted sores, often with a distinctive yellowish crust.