A boil is an abscess that started in a hair follicle. That is why boils turn up where hair and friction meet — the back of the neck, the armpit, the thigh, the buttocks. An abscess is any walled-off pocket of pus, and it can form anywhere in the body. So the honest answer to "is it a boil or an abscess" is usually both, and what matters is the size, how fast it is growing, and whether you feel unwell.
| The difference | Boil | Abscess |
|---|---|---|
| What it looks like | A red lump around a hair | A red, tight, shiny swelling |
| Treatment | Warm compresses, then drainage if needed | Drainage |
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.
Side by side
Boil
In a hair follicle
Bacteria — usually Staphylococcus aureus — get into the follicle. Your body then walls them off.
Abscess
Anywhere
A follicle, a cut, an injection site, an ingrown hair, a burst cyst, or no obvious entry point at all.
Boil
Pea to grape
Bigger than that, and most people reach for the word abscess.
Abscess
Any size
Small ones can drain on their own. Large ones need a clinic.
Boil
A red lump around a hair
It comes to a yellow or white head as it matures.
Abscess
A red, tight, shiny swelling
The centre softens as it fills. It feels like a small water balloon under the skin.
Boil
That is a carbuncle
Several connected boils in one mass. It sits deeper, scars more often, and usually needs to be drained in a clinic.
Abscess
Just a larger abscess
Joining together does not give it a new name.
Boil
Warm compresses, then drainage if needed
Ten minutes, three or four times a day. That helps a small one come to a head and drain on its own.
Abscess
Drainage
A clinician numbs it, opens it, and lets the pus out. Relief is usually immediate.
Boil
Not alone
They get added for larger ones, spreading redness, fever, boils on the face, or a weak immune system.
Abscess
Not alone
They get added for the same reasons.
Boil
Often
Abscess
Often
Boil
If "boils" keep coming back in the armpits, groin, buttocks, or under the breasts, they are often not boils. That pattern is hidradenitis suppurativa — the same few areas, again and again, sometimes with tunnels or rope-like scars between them. It is a long-term inflammatory condition, not a run of infections. That is why each course of antibiotics helps a little and never settles it.
Boil
A gum boil is a 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 coming back until the tooth is treated, so that one goes to a dentist.
Common questions