Comparison

Cyst vs Pimple

A cystic pimple is severe acne and resolves. An epidermoid cyst is a sac that does not. How to tell in about ten seconds, and why the treatments differ.
Written & medically reviewed by the Dermapedia team
At a Glance

The word "cyst" gets used for two completely different things, and that is where the confusion starts.

A cystic pimple is severe acne. It is deep, inflamed, painful, and it belongs to the same process as the rest of your breakouts. It comes and goes.

An epidermoid cyst is a sac under the skin. It is not acne. It has been there for months or years, it does not hurt, and it does not go away, because there is a physical pocket that keeps refilling.

The fastest way to tell: how long has it been there? Weeks means acne. Years means a cyst.

Epidermoid Cyst
A sac under the skin
Cystic Pimple
Severe acne

What it is

A closed pocket.

A sac grows from a hair follicle and slowly fills with keratin, the protein in skin and nails. Nothing is infected and nothing is inflamed. It is structural.

A deep blocked pore.

Oil, dead skin and bacteria plug a pore far below the surface. The inflammation spreads into the surrounding tissue instead of coming to a head.

How long it has been there

Months or years

Often "forever." Many people only notice it when it snags on a razor or a collar.

Days to weeks

Comes up, lasts one to three weeks, resolves, and another appears somewhere else.

Both
This is the single most reliable difference. Nothing else settles it as quickly.

Does it hurt

Usually not

Firm, rubbery, and it rolls under your finger. Only painful if it ruptures.

Yes

Deep, throbbing, tender before you can even see much on the surface.

The centre

A tiny dark dot

Look closely for a small opening in the middle, called a punctum. That dot is the old follicle, and it is close to a giveaway.

No dot

Just a red or skin-coloured swelling under the surface, with no visible head.

How many

One, usually

Occasionally a few, in the same general area.

Several, in waves

Comes with other acne — blackheads, papules, marks from previous spots.

Both
A single lump with no other breakouts anywhere is much more likely to be a true cyst.

Where

Face, neck, back, behind the ears, scalp

Also places acne rarely goes.

Where acne goes

Jawline, chin, cheeks, chest, upper back.

What actually treats it

Remove the sac.

Creams and acne treatments do nothing, because there is nothing for them to act on. If you want it gone, the whole sac has to be taken out in one piece — a short procedure under local anaesthetic, done when it is calm rather than inflamed.

Treat the acne, not the lump.

Prescription treatment. A dermatologist may inject a small dose of steroid directly into a single painful lump, which usually flattens it within a day or two.

Does it come back

Yes, if the sac is left

Squeezing the contents out empties it for a while. The sac stays and refills.

Not in that exact spot

But new ones appear until the underlying acne is treated.

Why it matters

Get it wrong and
you spend months on acne products that were never going to work.
The fix is
a procedure, not a cream.
Get it wrong and
you wait, and deep acne scars while you wait.
The fix is
prescription treatment, and sooner is better.

The trap: a cyst that flares

An epidermoid cyst that ruptures under the skin becomes red, hot and painful within a day or two. At that point it looks exactly like a severe inflamed spot, and plenty of people treat it as one.

Two clues point back toward a cyst: there was a painless lump in that exact spot before it flared, and there is a dark dot in the centre. If either is true, say so to whoever sees you — it changes the plan, because the sac will still need removing once the inflammation settles.

Why cystic acne deserves urgency

Deep acne scars. Not always, but often, and the dents and marks it leaves are much harder to treat than the acne was.

There is no drugstore product that reaches this kind of acne. Benzoyl peroxide, salicylic acid, and every "spot treatment" work on the surface, and this is happening well below it. Months spent working through cleansers is months of scarring.

If your spots are deep, painful lumps that last more than a week, that is the point to see someone. Prescription options work, and there are several — this is one of the more treatable things in dermatology.

Do not squeeze either one

With a cystic pimple, squeezing forces the contents deeper and widens the area of damage. It is the main reason a spot leaves a permanent dent.

With a cyst, squeezing can rupture the sac under the skin and turn a painless lump you had ignored for years into a painful, inflamed one that now needs urgent attention.

Neither one has anything useful you can get out.

See a dermatologist if

  • A lump has been there longer than a month without changing
  • Your spots are deep and painful, or are leaving marks and dents
  • A long-standing lump suddenly turns red, hot and sore
  • A lump is growing quickly, feels hard, or is fixed in place
  • You have an event coming up and one painful spot — a steroid injection can settle it in a day or two, and that is a normal thing to ask for
Questions people ask+
Pimple vs cyst — what is the difference?A cystic pimple is severe acne — deep, inflamed and painful, and it comes and goes with the rest of your breakouts. An epidermoid cyst is a physical sac under the skin that does not hurt and does not clear, because the pocket keeps refilling. The fastest test is time: weeks means acne, years means a cyst.
How can I tell which one I have?Ask how long it has been there. Weeks means acne. Years means a cyst. Then look for a tiny dark dot in the centre — that dot, called a punctum, points strongly to a true cyst.
Can I pop a cyst?No. Squeezing an epidermoid cyst can rupture the sac under the skin and turn a painless lump into a red, hot, painful one. And it does not solve anything, because the sac stays behind and refills.
Will a cyst go away on its own?An epidermoid cyst will not. There is a physical sac, and it stays until it is removed. A cystic pimple will resolve, but it may leave a mark or a dent.
Do acne products work on a cyst?No. There is nothing for them to act on. If you have spent months on cleansers and treatments with no change to a single lump, that is a strong clue it was never acne.
How is an epidermoid cyst removed?A short procedure under local anaesthetic, taking the whole sac out in one piece. It is done when the area is calm rather than inflamed, because an inflamed cyst is harder to remove intact.
My old lump suddenly turned red and painful. What happened?It probably ruptured under the skin. The contents leak into the surrounding tissue and your body reacts, which produces redness and pain that look exactly like an infection — often without any bacteria involved. It still needs seeing, and the sac will need removing later.
What can I do about a painful acne cyst before an event?A dermatologist can inject a small dose of steroid directly into it, which usually flattens it within a day or two. It is a normal thing to ask for.
Does cystic acne scar?Often, and the scars are much harder to treat than the acne. That is the main argument for treating it early with prescription options rather than working through drugstore products.