Back

Boil

(Carbuncle; Furuncle; Cutaneous Abscess; Skin Abscess; Abscess, Cutaneous; Abscess, Skin)

Definition

A boil is a red, swollen, painful bump under the skin that is caused by an infection. Boils often start in an infected hair follicle. Bacteria form an abscess or pocket of pus. With time, the pus may come to a head and drain out through the skin. Boils can occur anywhere, but common sites include the face, neck, armpits, buttocks, groin, and thighs.
There are several types of boils:
Pilonidal Cyst
IMAGE
Copyright © Nucleus Medical Media, Inc.

Causes

Causes of boils may include:

Risk Factors

Factors that increase your chance of a boil include:

Symptoms

A boil may cause:

Diagnosis

You will be asked about your symptoms and medical history. A physical exam will be done. A bacterial culture of the boil may be taken.
Some boils do not need medical attention and may drain on their own. More serious symptoms from boils may require treatment. These include:

Treatment

The boil can be drained if needed. The infection can be treated with antibiotics.
Home treatment may include:

Warm Compresses

Apply warm compresses to the boil for 20 minutes, 3-4 times a day. Depending on the area of the body affected, you may be able to soak the boil in warm water. These measures can ease the pain and help bring the pus to the surface. Repeated soaking will help the boil begin to drain.

Lancing the Boil

Do not pop or lance the boil yourself. This can spread the infection and make it worse. If the boil does not drain on its own or it is large, you may need to have it drained or lanced by your doctor.

Cleaning and Bandaging

Whether the boil drains on its own or was lanced by a doctor, you must keep it clean. Wash it with antibacterial soap and apply a medicated ointment and bandage. Clean the affected area 2-3 times a day until the wound heals completely.

Prevention

To help reduce your chance of a boil:

RESOURCES

American Academy of Dermatology http://www.aad.org

Family Doctor—American Academy of Family Physicians http://familydoctor.org

CANADIAN RESOURCES

Public Health Agency of Canada http://www.phac-aspc.gc.ca

The College of Family Physicians of Canada http://www.cfpc.ca

References

Acne. EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed. Updated February 24, 2015. Accessed August 5, 2015.

Boils. DermNet NZ website. Available at: http://www.dermnetnz.org/bacterial/boils.html. Updated June 2014. Accessed August 5, 2015.

Hidradenitis suppurativa. EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed. Updated March 16, 2015. Accessed August 5, 2015.

Nodulocystic acne. DermNet NZ website. Available at: http://www.dermnetnz.org/acne/nodulocystic-acne.html. Updated February 2014. Accessed August 5, 2015.

Pilonidal disease. EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed. Updated February 18, 2015. Accessed August 5, 2015.

Skin abscesses, furuncles, and carbuncles. EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed. Updated August 4, 2015. Accessed August 5, 2015.

Revision Information