What is the difference between a boil and carbuncle?

Single vs multiples. Boils and carbuncles are painful, pus-filled bumps that form under your skin when hair follicles become inflammed and infected by bacteria. Boils (furuncles) usually start as red, tender lumps. The lumps quickly fill with pus, grow larger and more painful until they rupture and drain. A carbuncle is a cluster of boils that form a connected area of infection under the skin.

Related Questions

What is the difference between a furuncle and carbuncle boil? I have heard of both of these sorts of boils and never been able to tell what makes them different. What are the defining differences between furuncle boils and carbuncle boils? .

Definitionally, . Definitionally, a furuncle is an infection of the hair follicle and it's associated oil gland (pilosebaceous unit) and usually starts out as a small, tender, red nodule that becomes painful and fluctuant (fluid-filled). A carbuncle are multiple furuncles grouped together, usually involving deeper layers of skin (i.e., fat). Read more...