Wart vs Corn vs Callus: How to Tell the Difference

Warts, corns and calluses often look similar, particularly on the feet. But they have different causes and need different treatments. Using a wart remover on a corn usually won't solve the problem, and treating the wrong skin lesion with acids or freezing products can cause unnecessary skin damage. Before choosing any treatment, it's worth taking a moment to work out what you're actually dealing with.

This guide won't tell you how to treat a wart, corn or callus — you'll find that in our other guides, linked throughout. Instead, it's designed to help you answer one question with more confidence: is this a wart, a corn, or a callus?

Written descriptions can only take you so far. If what you're looking at doesn't clearly match one pattern, don't treat it as a wart by default — ask a pharmacist instead.

The quickest way to tell the difference

If you only read one section, make it this one.

Most likely a wart: rough surface, skin lines often interrupted, may show small dark dots, can spread or appear in clusters. Most likely a corn: small, focal lesion over a pressure point, with a hard central plug and pain on direct pressure. Most likely a callus: broad area of thickened skin from repeated pressure or friction, usually with little pain.

These are clues, not a diagnosis — the table and sections below unpack each one.

Feature	Wart	Corn	Callus
Cause	HPV infection	Focal pressure or friction over a small area	Broader, repeated pressure or friction
Black dots	May show small dark or red-black dots	Usually absent	Usually absent
Skin lines	Often interrupted (can be hard to judge on thickened or treated skin)	More likely to continue across	More likely to continue across
Pain	May be tender when squeezed from the sides	Often tender with direct pressure over the central core	Usually little or no pain
Surface	Rough, raised	Hard central core	Thick, broad area of skin
Contagious	Yes	No	No
Typical location	Hands, fingers, soles of feet	Pressure points on toes and soles	Weight-bearing areas, palms
Responds to wart treatment	Often	No	No

These clues can help build the picture, but no single feature — including the direction of tenderness — can confirm the diagnosis on its own. Black dots, interrupted skin lines and pain pattern are the three most useful things to look at together, not a home diagnostic test.

Don't try to identify it yourself if it's:

Changing rapidly in size, shape or colour
Ulcerated, or bleeding without an obvious injury
Showing irregular or uneven pigment
Persistently painful
On the face or genitals

In any of these cases, see a pharmacist or GP rather than working through the clues below.

Five questions pharmacists ask

When someone comes in unsure what they're dealing with, pharmacists tend to work through a short mental checklist. Doing the same before you decide on a treatment can save you buying the wrong product.

Where is it? Location narrows things down quickly — a lump between the toes behaves differently to one on the fingers.
Does it hurt, and how? Tenderness on side-squeezing suggests a wart; tenderness on direct downward pressure points towards a corn; little or no pain is more consistent with a callus — though these patterns overlap and aren't conclusive on their own.
Can you see dark dots? Their presence makes a wart more likely, though their absence doesn't rule one out, and dark marks aren't unique to warts.
Have you tried treating it already? A lack of response to a wart treatment, or a treatment that seemed to help then stopped working, can be a clue that the diagnosis needs revisiting.
Has it changed recently? A lesion that's grown, changed colour, started bleeding, or altered in texture needs a closer look rather than a guess.

None of these questions gives a certain answer on its own, but together they build a much clearer picture — and they're the same questions worth asking yourself before reaching for a treatment.

Is it a wart?

Warts are caused by the human papillomavirus, or HPV. A verruca is a plantar wart on the sole of the foot — the same underlying cause, just a specific location. The virus infects the top layer of skin and causes it to grow rapidly, producing a small, rough lump.

If your lump has dark dots, interrupted skin lines, a rough or cauliflower-like surface, and has appeared over a few weeks or months, it's more likely to be a wart than a corn or callus. Here's what each of those clues means in more detail, though none is conclusive on its own:

Rough, uneven texture. Warts often feel bobbly or cauliflower-like, rather than smooth.
Small dark or red-black dots. These are usually tiny thrombosed capillaries — small surface blood vessels that have clotted — not a "root" growing into the skin. "Many people are surprised that black dots aren't roots," is a common observation from pharmacists fielding wart questions. That said, dark marks aren't unique to warts: they can also come from trauma, dried blood or bleeding under thick skin, and warts don't always show visible dots at all.
Interrupted skin lines. The natural ridges and lines of your skin (fingerprints, or the lines on the sole of your foot) are often interrupted by a wart and more likely to continue through a corn or callus — though thickened or previously treated skin can make this difficult to judge.
Tenderness when squeezed from the sides. Warts, especially verrucas, may be more tender when squeezed from the sides than when pressed straight down. It's a helpful clue, but pain patterns overlap — a thick plantar wart can also hurt with direct pressure — so it isn't a reliable test on its own.
Typical locations. Hands, fingers, around nails, and the soles of the feet are all common sites.
Growth pattern. Warts can appear singly or in clusters, and can spread to nearby skin or to other people through direct contact or shared surfaces such as swimming pool floors.

No single feature guarantees a diagnosis, and warts vary a lot in appearance depending on their location and how long they've been there. A verruca that's been walked on for months can look flattened and shiny rather than rough and raised. Verrucas are also often covered by a build-up of callus, which is one of the biggest reasons people struggle to identify them confidently on the sole of the foot.

Is it a corn?

Corns form where pressure repeatedly presses down on one small area of skin, usually because of friction against footwear, an unusual gait, or a bony prominence underneath.

If your lump sits directly over a pressure point, has a well-defined hard centre, hurts most when pressed straight down, and skin lines run through it rather than around it, it's more likely to be a corn than a wart. Here's what those clues mean in more detail:

A history of pressure. Corns almost always develop at a specific point that takes repeated, concentrated pressure — often from tight or poorly fitting shoes, high heels, or a toe that rubs against footwear.
A hard central core. A corn often contains a dense central plug of compacted keratin that presses into the underlying skin, which can make direct pressure painful. Unlike a wart, this isn't tied to a virus or a blood supply.
Pain on direct, downward pressure. Corns often hurt most when you press straight down onto the centre, though tenderness from the sides is also possible depending on site and inflammation, so this is a clue rather than a confirmed rule.
Common locations. The tops and sides of toes, between toes (these are usually softer, called soft corns), and the ball of the foot are typical spots.
Who gets them. Corns are common in people who wear narrow or high-heeled shoes, people with hammertoes or bunions, and anyone whose foot shape puts uneven pressure on certain points.

Corns don't spread to other people and won't appear in clusters the way warts sometimes do. They're a mechanical problem caused by pressure, not an infection.

There are also a couple of variations worth knowing. Hard corns are the classic small, dense lump usually found on the top of a toe or the sole of the foot. Soft corns develop between the toes, where sweat keeps the skin moist, and tend to feel rubbery rather than hard. Both share the same underlying cause — localised pressure — and the same central core, just in different environments on the foot.

Why they look different

In simple terms: a wart changes the structure of the skin because of a viral infection. A corn is a small plug of hard skin caused by focal pressure. A callus is a wider area of protective thickened skin caused by broader pressure or friction. That underlying difference is why a wart can bleed with small pinpoint dots, why a corn hurts most when pressed on its centre, and why a callus is usually painless.

Is it a callus?

A callus is a broader, flatter area of thickened skin that develops in response to repeated pressure or friction spread diffusely over a wider surface, rather than focused on one small point the way a corn is.

If the area is broad, flat and largely painless rather than a distinct lump, and it's turned up somewhere that takes regular friction or pressure — the heel, the ball of the foot, the palm — it's more likely to be a callus than a wart or corn.

Typical features:

Broad, thickened skin rather than a single raised lump.
Usually painless, or only mildly tender, since the thickening is the skin's normal protective response rather than a pinched or infected area.
Larger surface area than a wart or corn — calluses can cover a good portion of the heel, the ball of the foot, or the palm.
Common in specific groups: runners and walkers, people who spend long hours on their feet, manual workers, gardeners, and gym users who lift weights or use bars regularly.

Calluses are, in a sense, healthy skin doing its job. They only become a problem when they get thick enough to crack, or when they're mistaken for something that needs a very different kind of treatment.

A clue-based guide — not a diagnostic test

This is a way to work through the clues in a sensible order — the same order a pharmacist might reason through with you. It isn't a diagnostic test, and if the features conflict or you're unsure at any point, that's your cue to ask a pharmacist or podiatrist rather than keep guessing.

Are there small dark dots on the surface?
- Yes → suggests a wart.
- No → doesn't rule one out — move to the next question.
Does it hurt most when you press straight down on the centre?
- Yes → points towards a corn.
- No → move to the next question.
Is it a broad, thickened area of skin rather than a distinct lump?
- Yes → is more consistent with a callus.
- No, or the features don't line up → don't guess further. Ask a pharmacist or podiatrist.

Treat each "yes" as a clue that adds weight to one possibility, not a confirmed answer.

Why people confuse them

There's a good reason these three get muddled up so often, particularly on the feet.

All three commonly occur in the same locations — the sole of the foot, the ball of the foot, and around the toes are prime real estate for warts, corns and calluses alike. Pressure changes appearance over time more than friction does — a verruca on a weight-bearing part of the foot gets flattened by walking, which can make it look more like a corn than the classic cauliflower-textured wart people expect. Calluses can also form over the top of an existing corn or wart, effectively hiding the thing underneath and making it harder to identify by sight alone.

Pharmacists often say something along these lines: "A growth that isn't responding to wart treatment is sometimes a corn or callus rather than a wart." It's an easy mistake to make, and it's exactly why this article exists — to slow down the guesswork before you buy anything.

Wart or corn on the foot: the most useful clues

This is the highest-stakes version of the question, since warts, corns and calluses all cluster on the same weight-bearing parts of the foot.

Where the pressure sits. Corns form directly over a pressure point — the top of a toe, or a specific spot on the ball of the foot. Verrucas can appear anywhere on the sole, including areas that don't take concentrated pressure.
Skin lines. More likely interrupted over a verruca, more likely to continue across a corn — though this can be hard to judge once skin has thickened or been treated.
Focal core versus irregular surface. A corn tends to have a single, well-defined hard centre. A verruca's surface is often more irregular, even once flattened by walking.
Dark dots. A helpful supporting clue for a verruca when present, though their absence doesn't rule one out.
Tenderness pattern. Side-squeeze tenderness can support a verruca; direct-pressure tenderness can support a corn — but treat both as clues, not proof.
An overlying callus. Calluses often build up over both verrucas and corns on the foot, which can obscure the lesion underneath and make it harder to identify by sight alone.

If you've worked through these and you're still not confident, that's a normal outcome on the foot specifically — it's a common enough dilemma that pharmacists deal with it regularly.

What happens if you treat the wrong thing?

Getting the diagnosis wrong doesn't just waste money. It can genuinely set your skin back.

Treating a corn as a wart usually means applying a salicylic acid wart treatment, or a freezing treatment, to an area that doesn't have a viral cause. The underlying pressure causing the corn is still there, so there's no improvement — and the treatment can damage otherwise healthy skin around the corn in the process.

Treating a wart as a corn typically means focusing on pressure relief — padding, insoles, or filing down hard skin — without addressing the virus underneath. The pressure might ease, but the wart itself remains, and proper treatment gets delayed while the wart potentially spreads.

Treating a mole as a wart is the scenario that matters most. Applying a corrosive wart treatment to a mole, or freezing it, can damage the skin and — more importantly — delay the recognition of a change that should have been assessed by a doctor. This is precisely why certainty matters more than speed here.

When should you stop guessing?

Self-identifying a straightforward wart, corn or callus is often reasonable. But there are situations where it's best to stop guessing and speak to a pharmacist instead:

You're genuinely unsure what you're looking at
The lesion is changing in size, shape or colour
It's bleeding or won't heal
It's persistent despite trying an appropriate treatment
It's on the face or genitals
You're immunocompromised
You have diabetes, particularly if the lesion is on your foot

A pharmacist can assess the appearance, location and history, help distinguish common causes, and advise whether treatment or referral is appropriate. There's no charge for asking, and it can save you from buying the wrong product entirely.

What if it isn't any of these?

Sometimes a lump or rough patch of skin isn't a wart, corn or callus at all. Other common skin growths that get mistaken for warts include skin tags, moles, molluscum contagiosum (small, pearly bumps also caused by a virus), and seborrhoeic keratoses (harmless, wart-like growths that tend to appear with age).

This guide isn't the place to diagnose those conditions, and neither is a quick look in the mirror. If what you're seeing doesn't clearly match the wart, corn or callus descriptions above, that's itself a useful signal — get a pharmacist or GP to take a look rather than treating it as a wart by default.

Choosing the right treatment

Before buying a wart treatment, be reasonably confident you're dealing with a wart. Once you are, the next steps are straightforward:

If it's a wart — a topical wart treatment (such as salicylic acid) or a freezing treatment is usually appropriate. See our guides on how to get rid of warts and removing a wart at home for the full options.
If it's a corn — the priority is relieving the pressure causing it, alongside gentle removal of hard skin. Our corn treatment guide covers this in detail.
If it's a callus — regular moisturising, gentle filing, and reducing the friction causing it (better-fitting shoes, padded gloves for gym use, and so on) is usually all that's needed. See our callus treatment guide for more.

If you're still unsure after reading through this, that uncertainty is worth listening to — it's a reasonable reason to ask a pharmacist before buying anything.

A safety note: don't self-file, cut, or use medicated corn or callus products without professional advice if you have diabetes, poor circulation or reduced sensation in your feet.

The three biggest clues

If you only remember three things after reading this article:

Dark dots support a wart, but don't prove it.
Corns usually develop directly over a pressure point.
If you're unsure, don't start with a wart treatment — ask a pharmacist first.

Frequently asked questions

What's the difference between a wart and a corn?

A wart is caused by a virus (HPV) and often has small black dots and interrupted skin lines. A corn is caused by pressure and has a hard central core, with skin lines running straight through it.

How do you know if it's a wart?

Look for a rough or cauliflower-like surface, small black dots, and pain when squeezed from the sides rather than pressed directly. Interrupted skin lines are another useful clue.

Do corns have black dots?

Usually not. Small dark dots are more typically a feature of warts, caused by tiny thrombosed blood vessels near the surface, though their absence doesn't confirm a corn on its own.

Does a wart hurt when squeezed?

It may be more tender when squeezed from the sides than when pressed directly — this can help support a wart diagnosis, but pain patterns overlap, so it isn't a reliable test on its own.

Does a corn hurt when pressed?

Often, yes, most typically when pressed straight down onto the central core, though tenderness from the sides is also possible.

Can you use wart remover on a corn?

It's not recommended. Wart treatments are formulated around removing a viral growth and won't address the pressure causing a corn — they can also irritate the surrounding skin unnecessarily.

Do warts have roots?

No. The dark dots sometimes seen in warts are usually tiny thrombosed capillaries — clotted surface blood vessels — not roots growing into the skin.

Do corns have roots?

No. A corn has a hard central core of thickened skin, not a root.

Can a corn become a wart?

No — they have entirely different causes (pressure versus a virus) and one doesn't turn into the other. However, both can occur in the same area, which sometimes makes them harder to tell apart.

Can a wart become a corn?

No, for the same reason. It's possible to develop a corn over or near an existing wart, particularly if pressure builds up in that area, but the wart itself doesn't change into a corn.

Can calluses have black dots?

Not typically. Black dots point towards a wart rather than a callus, which is usually just an area of broad, thickened skin without this feature.

Can I cut a corn off myself?

Cutting or shaving hard skin yourself, especially with sharp implements, carries a real risk of injury and infection, particularly if you have diabetes or poor circulation. It's safer to use appropriate corn treatments or see a podiatrist.

Why isn't my wart treatment working?

Possible reasons include an incorrect diagnosis (the growth may be a corn or callus rather than a wart), inconsistent use, stopping treatment too early, or a wart that simply hasn't responded yet. If it hasn't improved after several weeks of consistent use, it's worth reconsidering the diagnosis with a pharmacist.

Can a verruca look like a corn?

Yes. Verrucas on weight-bearing parts of the foot get flattened by walking, and can end up looking harder and flatter than the classic wart appearance — one of the main reasons the two get confused.

Can I have both a wart and a corn?

Yes. It's possible to have a corn form over or near a verruca, particularly where pressure and a pre-existing wart occur in the same spot. If you're unsure, a pharmacist can help untangle the two.

When should I see a GP?

If a lesion is changing, bleeding, persistent despite appropriate treatment, on the face or genitals, or if you're immunocompromised or have diabetes, it's worth seeing a GP or podiatrist rather than continuing to self-treat.

Can a pharmacist tell the difference between a wart and a corn?

Often, yes. A pharmacist can assess the location, appearance and history of the lesion, and use that alongside the clues in this guide to advise on likely cause and appropriate next steps — including referral if anything looks atypical.

References

NHS — guidance on warts and verrucas, corns and calluses, and diabetes foot care
NICE Clinical Knowledge Summaries (CKS) — warts and verrucas
British Association of Dermatologists — patient information leaflets
Primary Care Dermatology Society — clinical guidance

Written by Christian Jakobsson