A pustule, in dermatology, is a small, raised skin lesion filled with pus.
Understanding Pustules
Pustules are a common skin condition characterized by their appearance and contents. Here's a more detailed look:
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Definition: A pustule is a circumscribed, elevated lesion filled with purulent fluid, less than 1 cm in size. This means it is a small, well-defined bump on the skin that contains pus.
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Size: Pustules are typically small, measuring less than 1 centimeter in diameter, as stated in the reference.
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Content: The fluid inside a pustule is purulent, commonly known as pus. This indicates an inflammatory response, often due to infection.
Pustule vs. Vesicle
It's important to distinguish pustules from other similar skin lesions, such as vesicles. Here's a table highlighting the key differences:
| Feature | Pustule | Vesicle |
|---|---|---|
| Fluid | Purulent (pus) | Clear fluid |
| Size | Less than 1 cm | Up to 1 cm |
| Appearance | Elevated, circumscribed, often yellowish/white | Elevated, circumscribed, often clear |
Examples of Conditions Featuring Pustules
Several dermatological conditions can manifest as pustules. Here are a few examples:
- Acne: One of the most common causes of pustules, acne often involves inflamed hair follicles and sebaceous glands, leading to pus-filled lesions.
- Erythema Toxicum Neonatorum: This common, benign rash in newborns can present as pustules.
Key Characteristics of Pustules
- Elevated: Pustules are raised above the surrounding skin surface.
- Circumscribed: They have well-defined borders.
- Purulent: They contain pus, indicating an inflammatory response.
- Small Size: They are generally less than 1 cm in diameter.
Management and Considerations
If you observe pustules, it is advisable to consult a dermatologist. They can accurately diagnose the underlying cause and recommend appropriate treatment options. Treating the underlying cause is key to resolving pustules.
