Boils and Carbuncles

Boils and carbuncles are types of skin infections that are caused by bacteria, typically Staphylococcus aureus. They are characterized by a collection of pus in the skin, which can be painful and tender to the touch.

What is a Boil?

A boil, also known as a furuncle, is a localized infection that occurs when bacteria enter the skin through a cut or scratch. It typically starts as a small, red, and painful bump, which can grow larger and more painful over time. As the infection progresses, the boil may fill with pus and eventually rupture, draining the pus and starting to heal.

What is a Carbuncle?

A carbuncle is a cluster of boils that are connected by tunnels under the skin. It is a more severe type of skin infection than a single boil and can be larger and more painful. Carbuncles often occur on the back, thighs, or buttocks and can take longer to heal than boils.

Symptoms

The symptoms of boils and carbuncles include:

  • Painful, red, and swollen bumps on the skin
  • Pus-filled bumps that may rupture and drain
  • Fever and chills
  • Swollen lymph nodes in the affected area
  • Redness and inflammation around the affected area

Causes and Risk Factors

Boils and carbuncles are caused by bacterial infections, typically Staphylococcus aureus. The risk factors for developing boils and carbuncles include:

  • Poor hygiene and skin care
  • Weakened immune system
  • Damaged or broken skin
  • Sharing personal items, such as towels or razors
  • Close contact with someone who has a boil or carbuncle

Treatment and Prevention

Treatment for boils and carbuncles typically involves:

  • Applying warm compresses to the affected area to promote drainage and healing
  • Using antibiotic ointments or creams to help clear up the infection
  • Taking oral antibiotics if the infection is severe or widespread
  • Practicing good hygiene and skin care, such as washing hands regularly and keeping the affected area clean and dry

To prevent boils and carbuncles, it is recommended to:

  • Practice good hygiene and skin care
  • Avoid sharing personal items
  • Keep cuts and scratches clean and covered
  • Avoid close contact with someone who has a boil or carbuncle

Complications

If left untreated, boils and carbuncles can lead to complications such as:

Frequently Asked Questions (FAQs)

What are boils and carbuncles?
Boils and carbuncles are bacterial skin infections that cause red, painful lumps under the skin.

What causes boils and carbuncles?
They are typically caused by Staphylococcus aureus bacteria, which can enter the skin through cuts or other openings.

What is the difference between a boil and a carbuncle?
A boil is a single, painful lump, while a carbuncle is a cluster of connected boils under the skin.

How are boils and carbuncles diagnosed?
Diagnosis is usually based on physical examination and sometimes laboratory tests to identify the bacteria.

Can boils and carbuncles be treated at home?
Mild cases may be treated with warm compresses, but more severe cases often require medical attention and possibly antibiotics.

Are boils and carbuncles contagious?
They can be spread through skin-to-skin contact or by sharing personal items, but the risk is generally low.

Can anyone get boils and carbuncles?
Yes, anyone can develop boils and carbuncles, but certain factors like poor hygiene, weakened immune system, or diabetes may increase the risk.

How long do boils and carbuncles last?
They typically last around 1-3 weeks, but can take longer to heal in some cases.

Can boils and carbuncles lead to complications?
If left untreated or not properly managed, they can lead to more serious infections, such as cellulitis or abscesses.

How can boils and carbuncles be prevented?
Practicing good hygiene, keeping skin clean, and avoiding sharing personal items may help reduce the risk of developing boils and carbuncles.

Article last updated on: 18th October 2025.
If you have any feedback, please get in touch.

See more

 Conditions  Symptoms  Procedures

Diagnosis Pad
Medical AI Assistant with Differentials, Guidance, Transcriptions, Notes, Medical Encyclopedia and Explainable AI.
Download from App Store Download from Google Play
Available for iOS, macOS and Android.

Medical Disclaimer

The information provided is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of a physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay seeking it because of something you have read on this site. We we do not guarantee, and assume no legal liability or responsibility for the accuracy, currency, or completeness of the information provided.