Which bacteria are specifically known for causing skin infections such as pustules?

Staphylococci bacteria are well-known for their role in causing various skin infections, including pustular infections. These bacteria are typically found on the skin and can lead to conditions like impetigo, folliculitis, and abscesses when they enter the body through breaks in the skin. Staphylococcus aureus, a specific type of staphylococcus, is particularly notorious for causing skin-related issues as well as more severe infections.

In contrast, while streptococci can also cause skin infections, they are more commonly associated with throat infections and can lead to conditions like cellulitis. Actinobacteria are a broader group and do not have the same specific association with skin infections as staphylococci. Clostridia is mainly known for causing infections like gas gangrene and is less related to superficial skin infections. This makes staphylococci the most relevant choice for this particular question regarding skin infections characterized by pustules.