What is the definition of a pustule?

The correct definition of a pustule is a raised lesion that contains pus, which can sometimes create a flat surface, but primarily is characterized by its raised nature and the presence of fluid (pus) within. A pustule appears elevated compared to the surrounding skin and often has a red base, indicating inflammation.

In contrast, flaky skin cells refer to a different type of skin condition that suggests dryness or a scalier texture. A solid bump that can be felt is more descriptive of a papule or nodule, which indicates a firm elevation without necessarily containing pus. A raised lesion with a flat surface does not adequately capture the essential characteristic of a pustule related to the pus content, which is significant for its identification. Understanding the distinct definitions and properties of various skin lesions helps in both diagnosing conditions and in selecting appropriate treatments in esthetic practice.