What is another name for a boil?

A boil is medically referred to as a furuncle. This type of skin condition arises when a hair follicle becomes infected, leading to the formation of a painful, pus-filled bump on the skin. The term "furuncle" specifically denotes the infection of the hair follicle, often due to bacteria such as Staphylococcus aureus, and is characterized by inflammation and swelling.

The other alternatives describe different conditions or terms that are not synonymous with a boil. A cyst typically refers to a closed sac filled with fluid or semi-solid material, which does not have the same infectious properties as a furuncle. Onycholysis pertains to a detachment of the nail from its nail bed, which is unrelated to the skin infections caused by bacteria. The term "Stage 2" in this context is vague and does not specifically identify a skin condition, such as a boil, making furuncle the definitive and accurate term to describe this type of lesion.