Final answer:
Bacteria are the pus-forming organisms that grow in clusters and cause abscesses, pustules, pimples, and boils. Staphylococcus aureus is one example of bacteria that can cause these types of infections.
Step-by-step explanation:
The pus-forming organisms that grow in clusters and cause abscesses, pustules, pimples, and boils are bacteria. One example of such bacteria is Staphylococcus aureus. These infections, often caused by bacteria like Staphylococcus, can manifest as furuncles (boils) and can be deeper and more severe than other skin infections. Good hygiene and skin care are important in preventing these infections from becoming more severe or spreading.