Epidermoid Cyst
An epidermal cyst. The tiny dark dot in the centre is the punctum — the opening of the follicle the sac grew from, and the feature most worth looking for.
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Cyst vs Pimple
A cyst is a deeper lump that stays. It is a sac under the skin, it usually does not hurt, and it keeps refilling because the sac is still there. A cystic pimple is severe acne. It hurts, it sits closer to the surface, and it clears in a week or three — so how long the lump has been there is the fastest way to tell them apart.
At a glance
| The difference | Epidermoid Cyst | Cystic Pimple |
|---|---|---|
| What it is | A closed pocket | A deep blocked pore |
| Does it hurt | Usually not | Yes |
| What actually treats it | Remove the sac | Treat the acne, not the lump |
Cystic Pimple
A pimple on the cheek. It is red and inflamed with a white head, and it comes up over a day or two rather than sitting in place for months.
Side by side
The differences that matter
What it is
Epidermoid Cyst
A closed pocket
A sac grows from a hair follicle and slowly fills with keratin, the protein in skin and nails. Nothing is infected. It is structural.
Cystic Pimple
A deep blocked pore
Oil, dead skin and bacteria plug a pore below the surface. The inflammation spreads into the tissue around it instead of coming to a head.
How long it has been there
Epidermoid Cyst
Months or years
Often "forever." Many people only notice it when it snags on a razor or a collar.
Cystic Pimple
Days to weeks
It comes up, lasts one to three weeks, and fades. Another appears somewhere else.
Does it hurt
Epidermoid Cyst
Usually not
Firm, rubbery, and it rolls under your finger. It only hurts if it ruptures.
Cystic Pimple
Yes
Deep, throbbing and tender, before you can see much on the surface.
The centre
Epidermoid Cyst
A tiny dark dot
Look for a small opening in the middle, called a punctum. That dot is the old follicle, and it is close to a giveaway.
Cystic Pimple
No dot
Just a red or skin-coloured swelling under the surface, with no head.
How many
Epidermoid Cyst
One, usually
Sometimes a few in the same area. One lump with no other breakouts is much more likely to be a true cyst.
Cystic Pimple
Several, in waves
It comes with other acne: blackheads, papules, and marks from old spots.
Where
Epidermoid Cyst
Face, neck, back, behind the ears, scalp
Also places acne rarely goes.
Cystic Pimple
Where acne goes
Jawline, chin, cheeks, chest, upper back.
What actually treats it
Epidermoid Cyst
Remove the sac
Creams and acne products do nothing here. There is nothing for them to act on. To be rid of it, the whole sac has to come out in one piece. That is a short procedure under local anaesthetic, done when the lump is calm.
Cystic Pimple
Treat the acne, not the lump
Prescription treatment. A dermatologist can also inject a tiny dose of steroid straight into one painful lump. That usually flattens it in a day or two.
Does it come back
Epidermoid Cyst
Yes, if the sac is left
Squeezing empties it for a while. The sac stays, and it refills.
Cystic Pimple
Not in that exact spot
But new ones appear until the acne itself is treated.
Why it matters
Epidermoid Cyst
- Get it wrong and — you spend months on acne products that were never going to work.
- The fix is — a procedure, not a cream.
Cystic Pimple
- Get it wrong and — you wait, and deep acne scars while you wait.
- The fix is — prescription treatment, and sooner is better.
Do not squeeze either one
Cystic Pimple
Squeezing a cystic pimple pushes the contents deeper and widens the damage. It is the main reason a spot leaves a permanent dent.
Common questions
Questions Patients 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.