Final answer:
A boil, which is a subcutaneous abscess filled with pus, is known as a furuncle. It is a small, purulent skin lesion often caused by Staphylococcus bacterial infections.
Step-by-step explanation:
A subcutaneous abscess filled with pus, also called a boil, is a furuncle. A furuncle is a small, purulent skin lesion, which can be caused by bacterial infections, such as those from Staphylococcus bacteria. It is characterized by pus and swelling. In contrast, a carbuncle is typically a deeper infection formed from multiple furuncles and often associated with systemic symptoms like fever and a general feeling of illness. A pustule is a more general term for any pus-filled bump on the skin, while a nodule is a small, raised bump on the skin without pus. Good hygiene and skin care are important for preventing furuncles from becoming more serious.