A carbuncle is a painful cluster of boils caused by a deep bacterial infection of several neighboring hair follicles under the skin. It usually appears as a red, swollen, tender lump with multiple pus-filled “heads” or drainage openings and often makes a person feel generally unwell (fever, fatigue, chills).

What a carbuncle is

  • A carbuncle is essentially several infected hair follicles (boils) that have merged into one larger, deeper skin infection.
  • It is most often caused by Staphylococcus aureus bacteria, including sometimes MRSA (a resistant strain), and is considered contagious through contact with infected material.

What it looks and feels like

  • It typically shows up as a firm, red, very tender lump that can range from pea-sized to much larger, with multiple white or yellow points where pus may drain.
  • The surrounding skin is hot, swollen, and indurated (thickened), and people can also have fever, malaise, or swollen nearby lymph nodes.

Common locations and who gets them

  • Carbuncles usually appear on hair-bearing, thicker-skin areas like the back of the neck, upper back, buttocks, and thighs, but can occur wherever there are hair follicles.
  • They are more common in people with diabetes, weakened immune systems, poor hygiene, or conditions like eczema that break the skin barrier.

Treatment basics and when to worry

  • Many carbuncles need medical drainage (a small cut to let the pus out) plus antibiotics, especially if there are systemic symptoms like fever or if the person is high-risk.
  • Urgent medical care is important if the area spreads quickly, you feel very unwell, the carbuncle is on the face or spine, or you have diabetes or immune problems, because untreated infections can spread to deeper tissues or the bloodstream.

Simple self-care and prevention

  • Until seen by a clinician, keeping the area clean, using warm compresses, and not squeezing or cutting the lump yourself can help reduce complications.
  • Good hygiene, not sharing towels/razors, managing underlying conditions like diabetes, and cleaning/disinfecting any draining wounds lower the chance of carbuncles forming or spreading in a household.

Note: This is general information and not a diagnosis; any painful, worsening, or recurrent skin lump should be evaluated promptly by a healthcare professional.

Information gathered from public forums or data available on the internet and portrayed here.