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Boils

Furuncle

 

A boil is an infection that affects groups of hair follicles and nearby skin tissue.

Related conditions include:

  • Carbunculosis
  • Folliculitis

Causes

 

Boils are very common. They are most often caused by the bacteria Staphylococcus aureus . They can also be caused by other types of bacteria or fungi found on the skin's surface. Damage to the hair follicle allows the infection to grow deeper into the follicle and the tissues under it.

Boils may occur in the hair follicles anywhere on the body. They are most common on the face, neck, armpit, buttocks, and thighs. You may have one or many boils. The condition may occur only once or it can be a long-lasting (chronic) problem.

 

Symptoms

 

A boil may begin as tender, pinkish-red, and swollen, on a firm area of the skin. Over time, it will feel like a water-filled balloon or cyst .

Pain gets worse as it fills with pus and dead tissue. Pain lessens when the boil drains. A boil may drain on its own. More often, the boil needs to be opened to drain.

The main symptoms of a boil include:

  • A bump about the size of a pea, but may be as large as a golf ball
  • White or yellow center ( pustules )
  • Spread to other skin areas or joining with other boils
  • Quick growth
  • Weeping, oozing, or crusting

Other symptoms may include:

  • Fatigue
  • Fever
  • General ill-feeling
  • Itching before the boil develops
  • Skin redness around the boil

 

Exams and Tests

 

The health care provider can usually diagnose a boil based on how it looks. A sample of cells from the boil may be sent to the lab for a culture to look for staphylococcus or other bacteria.

 

Treatment

 

Boils may heal on their own after a period of itching and mild pain. More often, they become more painful as pus builds up.

Boils usually need to open and drain in order to heal. This most often happens within 2 weeks. You should:

  • Put warm, moist, compresses on the boil several times a day to speed draining and healing.
  • Never squeeze a boil or try to cut it open at home. This can spread the infection.
  • Continue to put warm, wet, compresses on the area after the boil opens.

You may need to have surgery to drain deep or large boils. Get treatment from your provider if:

  • A boil lasts longer than 2 weeks.
  • A boil comes back.
  • You have a boil on your spine or the middle of your face.
  • You have a fever or other symptoms with the boil.
  • The boil causes pain or discomfort.

It is important to keep a boil clean. To do this:

  • Clean boils and change their dressing often.
  • Wash your hands well after touching a boil.
  • DO NOT re-use or share washcloths or towels. Wash clothing, washcloths, towels, and sheets or other items that have touched infected areas in hot water.
  • Throw out used dressings in a sealed bag so that fluid from the boil does not touch anything else.

Your provider may give you antibiotics to take by mouth, or a shot, if the boil is very bad or comes back.

Antibacterial soaps and creams cannot help much once a boil has formed.

 

Outlook (Prognosis)

 

Some people have repeated boil infections and are unable to prevent them.

Boils in areas like the ear canal or nose can be very painful.

Boils that form close together may expand and join, causing a condition called carbunculosis.

 

Possible Complications

 

These complications may occur:

  • Abscess of the skin, spinal cord, brain, kidneys, or other organ
  • Brain infection
  • Heart infection
  • Bone infection
  • Infection of the blood or tissues ( sepsis )
  • Spinal cord infection
  • Spread of infection to other parts of the body or skin surfaces
  • Permanent scarring

 

When to Contact a Medical Professional

 

Call your provider if boils:

  • Appear on your face or spine
  • Come back
  • Do not heal with home treatment within 1 week
  • Occur along with a fever, red streaks coming out from the sore, a large build-up of fluid in the area, or other symptoms of infection
  • Cause pain or discomfort

 

Prevention

 

The following may help prevent the spread of infection:

  • Antibacterial soaps
  • Antiseptic (germ-killing) washes
  • Keeping clean (such as thorough hand washing)

 

 

References

Habif TP. Bacterial infections. In: Habif TP, ed. Clinical Dermatology: A Color Guide to Diagnosis and Therapy . 6th ed. Philadelphia, PA: Elsevier; 2016:chap 9.

Marks JG, Miller JJ. Localized erythema. In: Marks JG, Miller JJ, eds. Lookingbill and Marks' Principles of Dermatology . 5th ed. Philadelphia, PA: Elsevier; 2013:chap 15.

 
  • Hair follicle anatomy - illustration

    At the base of the hair follicle are sensory nerve fibers that wrap around each hair bulb. Bending the hair stimulates the nerve endings allowing a person to feel that the hair has been moved. One of the main functions of hair is to act as a sensitive touch receptor. Sebaceous glands are also associated with each hair follicle that produce an oily secretion to help condition the hair and surrounding skin.

    Hair follicle anatomy

    illustration

    • Hair follicle anatomy - illustration

      At the base of the hair follicle are sensory nerve fibers that wrap around each hair bulb. Bending the hair stimulates the nerve endings allowing a person to feel that the hair has been moved. One of the main functions of hair is to act as a sensitive touch receptor. Sebaceous glands are also associated with each hair follicle that produce an oily secretion to help condition the hair and surrounding skin.

      Hair follicle anatomy

      illustration


     

    Review Date: 10/31/2016

    Reviewed By: Kevin Berman, MD, PhD, Atlanta Center for Dermatologic Disease, Atlanta, GA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.

    The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.

     
     
     

     

     

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