For larger boils and carbuncles, treatment may include: Incision and drainage. Your doctor may drain a large boil or carbuncle by making an incision in it. Deep infections that can’t be completely drained may be packed with sterile gauze to help soak up and remove additional pus.
https://www.mayoclinic.org/diseases-conditions/boils-and-carbuncles/diagnosis-treatment/drc-20353776

