Final answer:
The pus-forming bacteria that grow in clusters and cause abscesses, pustules, and boils are known as Staphylococcus, particularly the Staphylococcus aureus strain.
Step-by-step explanation:
Pus-forming bacteria that grow in clusters and can cause abscesses, pustules, and boils are Staphylococcus. Specific strains of Staphylococcus aureus are frequently associated with purulent skin infections that manifest as folliculitis, furuncles, or carbuncles, which are infections of the skin. These can start as minor infections but might become more severe if not properly treated. S. aureus is a type of gram-positive bacteria that often forms grape-like clusters, which can be identified through a Gram stain. This bacterium is known to be resistant to many antibiotics, with MRSA strains being resistant to a wide range of antibiotics.