A boil (furuncle) is an infection of a hair follicle. It is usually caused by a germ called Staphylococcus aureus.
A boil looks like a small red lump on the skin that is tender. They usually occur as a one-off in a healthy person.
Treatment commonly involves draining the pus and/or taking a course of antibiotics. If you have recurring boils you are advised to have tests to check for an underlying cause.
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