Compare · Conditions

Boils vs Carbuncle

Deep bacterial infection of a hair follicle producing a tender lump. A deeper cluster of interconnected boils with several draining openings.

Research updated 2026-10-23
Educational illustration of one localized swollen follicular bump with a small pale pustular center on an upper arm on light skin.AI-generated educational illustration: Close adult upper back with a localized connected cluster of inflamed follicular nodules and a few tiny drainage openings; restrained, no large open wound. Not a clinical photograph.
Key differencesWhat is it?What it looks likeDiagramsWhen it startsTriggersDaily CareTreatmentOutlookComplicationsWhen to get helpQuestions

Key differences

The same eight facts on every condition comparison.

Usual age
Any age
Any age
Where
Hair-bearing, rubbed skin
Back of neck; hair-bearing skin
Main sign
A tender red lump that comes to a head
A cluster of boils with several openings
Itch or pain
Painful
Painful
Contagious
The bacteria can spread
The bacteria can spread
Long term
Drains and heals; can recur
Needs drainage and often antibiotics
Scars
Can leave a small scar
Often scars
Who gets it
Anyone; staph carriers
Diabetes, weakened immunity

What is it?

Boils
Carbuncle
What is it?
  • What it is
    Deep bacterial infection of a hair follicle producing a tender lump.
  • What it is
    A deeper cluster of interconnected boils with several draining openings.

What it looks like

Boils

A shoulder with a raised red bump and a small yellow-white center.

Boils A rounded red swelling stands out on the shoulder.

Carbuncle

An upper back with a large inflamed area containing several raised pale-centered bumps.

Carbuncle Several pale-centered openings sit within a broad red-purple mound.

Skin tones
Educational illustration of one localized swollen follicular bump with a small pale pustular center on an upper arm on light skin.
Educational illustration of one localized swollen follicular bump with a small pale pustular center on an upper arm on medium skin.
Educational illustration of one localized swollen follicular bump with a small pale pustular center on an upper arm on brown skin.
Educational illustration of one localized swollen follicular bump with a small pale pustular center on an upper arm on deep skin.
Educational illustration of a connected cluster of swollen follicular bumps with several small pale pustular heads on a shoulder on light skin.
Educational illustration of a connected cluster of swollen follicular bumps with several small pale pustular heads on a shoulder on medium skin.
Educational illustration of a connected cluster of swollen follicular bumps with several small pale pustular heads on a shoulder on brown skin.
Educational illustration of a connected cluster of swollen follicular bumps with several small pale pustular heads on a shoulder on deep skin.
In the skin

Bacteria, commonly Staphylococcus aureus, infect a hair follicle and nearby tissue. A deeper collection of pus forms as the immune system responds.

Infection involves several neighboring hair follicles and the tissue between them. Connected collections of pus form a deeper inflammatory mass.

When it usually starts

010203040506070+

Boils. Can occur at any age.

Carbuncle. Can occur at any age.

Causes and triggers

Causes

Usually staphylococcal bacteria infect a follicle and nearby tissue.

Neighbouring infected follicles form a connected abscess.

Risk factors
Skin breaks, Bacterial colonisation, Diabetes or immune suppression
Skin breaks, Bacterial colonisation, Diabetes or immune suppression
Trigger
● Boils
● Carbuncle
Skin injury
Can contribute
Can contribute
Friction
Can contribute
Can contribute

Daily Care

Boils
Carbuncle
Daily care

Habits that help

  • Keep the area gently clean and cover any drainage
    Use a clean non-stick dressing and replace it when wet, dirty or as instructed.
  • Wash hands before and after dressing changes
    Dispose of used dressings safely and clean surfaces contaminated by drainage.
  • Keep towels, washcloths and razors for your own use
    Launder items that touch the affected area and let them dry fully.
  • Reduce pressure and rubbing over the lump
    Choose loose clothing and avoid shaving across inflamed skin.
  • Use a comfortably warm clean compress for a small boil
    Hold it on for 10–15 minutes several times daily; avoid hot temperatures and never force drainage.

Avoid

  • Avoid: Squeezing, lancing or piercing the lump at home
    This can spread infection; a collection of pus may need professional drainage.
  • Avoid: Delaying assessment for spreading redness, fever or worsening pain
    Home care does not replace drainage or antibiotics when they are needed.

Habits that help

  • Keep the area gently clean and cover any drainage
    Use a clean non-stick dressing and replace it when wet, dirty or as instructed.
  • Wash hands before and after dressing changes
    Dispose of used dressings safely and clean surfaces contaminated by drainage.
  • Keep towels, washcloths and razors for your own use
    Launder items that touch the affected area and let them dry fully.
  • Reduce pressure and rubbing over the lump
    Choose loose clothing and avoid shaving across inflamed skin.
  • Arrange prompt assessment for a cluster of connected boils
    A deeper or larger infection may need drainage and other treatment even with careful hygiene.

Avoid

  • Avoid: Squeezing, lancing or piercing the lump at home
    This can spread infection; a collection of pus may need professional drainage.
  • Avoid: Delaying assessment for spreading redness, fever or worsening pain
    Home care does not replace drainage or antibiotics when they are needed.

Treatment differences

Evidence labels come from each condition’s own treatment list.

Treatment
● Boils
● Carbuncle
Prescription pills

Antibiotics when indicated

Listed

Spreading infection, systemic illness or individual risk factors may require antibiotics alongside source control.

Antibiotics when indicated

Listed

Spreading infection, systemic illness or individual risk factors may require antibiotics alongside source control.

Procedures
Editorial illustration for Incision and Drainage, based on the entry’s treatment or equipment reference.

Incision and drainage

Listed

A clinician may need to drain a collection of pus; do not lance it at home.

Editorial illustration for Incision and Drainage, based on the entry’s treatment or equipment reference.

Incision and drainage

Listed

A clinician may need to drain a collection of pus; do not lance it at home.

Outlook

Long term

A boil can heal after it drains, but deeper or worsening infections may need professional treatment. Repeated boils warrant assessment for contributing factors rather than repeated squeezing or self-drainage.

A carbuncle usually needs assessment and may require drainage and antibiotics. Healing can leave a scar; fever, spreading redness or worsening illness needs prompt care.

Complications

Possible complications

Infection can spread to nearby skin or cause systemic illness.

Infection can spread to nearby skin or cause systemic illness.

When to get help

When to get help

Seek prompt care for a painful pus collection; fever, spreading swelling or feeling unwell increases urgency.

Arrange prompt clinical assessment; fever or rapidly spreading inflammation needs urgent care.

Common questions

Boils:What is Boils?

Deep bacterial infection of a hair follicle producing a tender lump.

Boils:What can I do day to day?

Keep the area clean and covered. Do not squeeze or lance it; do not share towels.

Boils:When should I get medical advice?

Seek prompt care for a painful pus collection; fever, spreading swelling or feeling unwell increases urgency.

Carbuncle:What is Carbuncle?

A deeper cluster of interconnected boils with several draining openings.

Carbuncle:What can I do day to day?

Keep the area clean and covered. Do not squeeze or lance it; do not share towels.

Carbuncle:When should I get medical advice?

Arrange prompt clinical assessment; fever or rapidly spreading inflammation needs urgent care.

Sources

Sources and further reading

  1. Boil
  2. Boil
Dermapedia on YouTube