What do pustules contain?

Pustules are small, inflamed, raised lesions on the skin that contain pus. Pus is typically a thick fluid composed of dead white blood cells, bacteria, and cellular debris. This accumulation is often a result of infection or inflammation, indicating that the body is responding to a pathogenic invasion or irritant.

In contrast to other types of skin lesions, pustules are specifically characterized by their cloudy or yellowish appearance due to the presence of pus, which sets them apart from blisters that may contain clear fluid or other substances. Understanding the nature of pustules is crucial in medical settings, as it can help in diagnosing skin conditions such as acne, folliculitis, or other infections that may require treatment.