Comparison

Boil vs Abscess

A boil is an abscess that started in a hair follicle. Same pus, same treatment. What actually matters is size, speed, and whether you feel unwell.
Written & medically reviewed by the Dermapedia team
At a Glance

A boil is an abscess. The word just tells you where it started.

An abscess is any walled-off pocket of pus. It can form anywhere in the body, from any source of bacteria.

A boil is an abscess that began in a hair follicle. Same pus, same wall, same treatment. That is why boils turn up where hair and friction meet — the back of the neck, the armpit, the thigh, the buttocks, the waistband line.

So the honest answer to "is it a boil or an abscess" is usually "both." What actually matters is size, how fast it is growing, and whether you feel unwell.

Boil
Furuncle
Abscess
Any walled-off pus
A boil sitting proud of the skin. Note the wide pink flush spreading well beyond the lump itself — that is the surrounding tissue reacting, and it is why a boil feels sore over a larger area than it looks. The yellow point in the centre means it is coming to a head and close to draining on its own.
The same process, deeper and further along. Two separate points of pus have formed rather than one, which happens when more than one follicle is involved. At this size it is unlikely to resolve with warm compresses alone.

Where it starts

In a hair follicle

Bacteria — usually Staphylococcus aureus — get into the follicle and your body walls them off.

Anywhere

A follicle, a cut, an injection site, an ingrown hair, a ruptured cyst, or a spot with no obvious entry point.

Size

Pea to grape
Any size

An abscess can be small enough to drain itself or large enough to need a clinic.

Both
Size and speed matter far more than which word you use. Anything still growing after three or four days should be seen.

What it looks like

A red lump around a hair

Comes to a yellow or white head as it matures.

A red, tight, shiny swelling

The centre softens as it fills — clinicians call that fluctuance. It feels like a small water balloon under the skin.

Do you feel unwell

Sometimes
Sometimes
Both
Fever, chills, or feeling generally run down means it should be looked at today, whichever word applies.

When several join together

That is a carbuncle

Multiple connected boils in one mass. Deeper, more likely to scar, and more likely to need clinical drainage.

Just a larger abscess

Treatment

Warm compresses, then drainage if needed.

Ten minutes, three or four times a day, encourages a small one to come to a head and drain on its own.

Drainage.

A clinician numbs it, opens it, and lets the pus out. Relief is usually immediate.

Both
This is the same treatment. The name does not change the plan.

Do antibiotics fix it

Not alone
Not alone
Both
A drug struggles to reach inside a walled-off pocket of pus. Drainage is the treatment. Antibiotics are added for larger ones, spreading redness, fever, facial locations, or a weakened immune system.

Does it scar

Often
Often
Both
Squeezing is the main avoidable cause. It pushes material deeper instead of out and widens the damage.
Close-up of a raised, dome-shaped red lump on pale skin, ringed by a wide pink flush, with a small yellow-white point of pus at its centre.
A boil sitting proud of the skin. Note the wide pink flush spreading well beyond the lump itself — that is the surrounding tissue reacting, and it is why a boil feels sore over a larger area than it looks. The yellow point in the centre means it is coming to a head and close to draining on its own.
A forearm on a clinic table, with a broad raised red swelling on the outer surface and two small yellow points of pus near its centre.
The same process, deeper and further along. Two separate points of pus have formed rather than one, which happens when more than one follicle is involved. At this size it is unlikely to resolve with warm compresses alone.

The pattern that changes the answer

If "boils" keep coming back in the armpits, groin, buttocks, or under the breasts, they are often not boils at all. That pattern — the same few areas, repeatedly, sometimes with tunnels or rope-like scarring between them — is hidradenitis suppurativa.

It is a long-term inflammatory condition, not a series of infections. That is why each course of antibiotics helps a little and never settles it. It is commonly mistaken for bad luck with boils for years before anyone names it, and naming it is what unlocks treatment that actually works.

If you have had more than two or three in a skin fold, say that pattern out loud to a doctor rather than presenting each one as a fresh problem.

What "gum boil" means

Different thing wearing the same word. A tender bump on the gum is usually a dental abscess draining from an infected tooth root. It will keep returning until the tooth is treated, so that one goes to a dentist.

Do not squeeze it

Pressing on a walled-off pocket can push bacteria deeper into the tissue instead of out through the skin. On the face, especially around the nose and upper lip, that carries real risk and needs medical attention rather than a home attempt.

Go the same day if

  • It is bigger than a pea and still growing
  • You have a fever or chills
  • Red streaks are spreading out from it
  • It is on your face, especially near your nose or eyes
  • You have diabetes, a suppressed immune system, or take medication that suppresses it
  • It has opened but will not heal shut
Questions people ask+
Is a boil the same as an abscess?Essentially yes. A boil is an abscess that started in a hair follicle. Same pus, same walled-off pocket, same treatment — the word just tells you where it began.
Abscess vs boil — what is the difference?There is no real difference in what they are. An abscess is any walled-off pocket of pus; a boil is an abscess that started in a hair follicle. Same pus, same wall, same treatment — what actually matters is the size, how fast it is growing, and whether you feel unwell.
What is a carbuncle?Several boils joined together under the skin into one larger mass. Deeper, more likely to scar, more likely to come with fever, and more likely to need clinical drainage.
Can I pop a boil at home?No. Squeezing pushes bacteria deeper instead of out. Warm compresses several times a day encourage a small one to come to a head on its own. Anything still growing after a few days should be drained properly.
Do I need antibiotics for a boil?Often not. Drainage is the treatment, and antibiotics alone frequently fail because the drug struggles to reach inside a walled-off pocket. They get added for larger ones, spreading redness, fever, facial locations, or a weakened immune system.
What is a gum boil?A different thing with the same word — usually a dental abscess draining from an infected tooth root. It keeps returning until the tooth is treated, so that goes to a dentist.
Why do I keep getting boils in the same place?Repeated ones in the armpits, groin, buttocks or under the breasts are often hidradenitis suppurativa, a long-term inflammatory condition rather than a series of infections. That is why each antibiotic course helps a little and never settles it.
Are boils contagious?The bacteria can spread to other parts of your own skin and to people you share towels, razors or bedding with. Cover it and do not share those things while it is open.