Condition

Intertrigo

Intertrigo is a raw, sore rash in a skin fold, caused by skin rubbing on skin in a warm, damp space. Yeast very often moves in on top of it.
At a Glance

Intertrigo is a rash where two surfaces of skin touch and stay damp — under the breasts, in the groin, under a belly fold, in the armpits, or between the toes. It starts as friction and trapped moisture, and then yeast, usually Candida, commonly grows on top. That is why small satellite spots appear just outside the main patch.

The mainstays are drying the fold thoroughly, a barrier cream such as zinc oxide, moisture-wicking fabric, and an antifungal.

The honest catch: a plain moisturizer or a steroid used on its own can make it worse. Moisturizer adds to the dampness, and a steroid alone quiets the redness while the yeast keeps growing.

Key Facts

How CommonVery common, especially in hot weather and in anyone with deep skin folds.
Who Gets ItAdults carrying extra weight, older adults, babies in the nappy area, athletes, and people who sweat heavily. More common in people with diabetes.
Chronic or CurableCurable each time. It comes back easily in the same fold unless the moisture and friction are managed.
Rx RequiredNo for a mild case. Stubborn ones usually need a prescription antifungal, sometimes with a low-strength steroid.
ContagiousNo. The yeast involved already lives on normal skin.

Symptoms

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Intertrigo starts as a shiny, sore patch deep in a fold, and it is usually worse in hot weather and by the end of the day.

What it looks and feels like

A patch with a mirror image — the rash sits on both sides of the fold, matching exactly where skin touches skin.
A raw, shiny, moist surface — rather than dry and scaly.
Burning and stinging — often more sore than itchy.
Small spots just outside the main patch — called satellite lesions. These are the tell that yeast has moved in.
Cracking or splitting deep in the crease — painful, and slow to heal while the fold stays damp.
A smell — usually means bacteria are involved as well as yeast.
A white, curd-like film — yeast growing in the deepest part of the fold.

Where it shows up

  • Under the breasts, and in the crease under a belly fold.
  • The groin creases and between the buttocks.
  • The armpits.
  • Between the toes, where it overlaps with athlete's foot.
  • Neck folds and behind the ears, particularly in babies and older adults.
  • Under a cast or brace, or where a prosthesis meets skin.

How it looks on different skin tones

On light skin, intertrigo is bright red and glossy. On brown and Black skin it more often looks dark brown, purple or grey, and the redness people are told to look for may not be there at all. The satellite spots and the mirror-image shape are more reliable clues than colour. Once it settles, the fold is often left darker than the surrounding skin for weeks to months. That is pigment change from the inflammation, not scarring.

Light
Medium
Brown
Deep

If your fold rash does not fit this, see Lookalikes near the bottom of this page.

Causes & Risk Factors

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Intertrigo begins as a mechanical problem. Where two surfaces of skin sit against each other, sweat cannot evaporate, the outer layer softens in the trapped moisture, and constant rubbing wears it away. That damp, damaged surface is inflamed on its own, before any germ is involved.

What happens next is what makes intertrigo different from ordinary chafing. Warm, wet, broken skin is an ideal home for organisms that already live on you, and yeast — usually Candida — very often moves in on top. Bacteria can join it. This is why treatment aimed only at moisture or only at inflammation tends to fail or backfire. Deep folds, heat, sweating, incontinence, tight clothing and carrying extra weight all raise the odds. So does diabetes, because higher blood sugar makes yeast overgrowth easier. Stubborn or repeated intertrigo is occasionally the thing that leads to a diabetes diagnosis, so it is reasonable to have blood sugar checked if this keeps happening.

What Hurts and What Helps

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What Makes It Worse

  • Heat and humidity. Most people notice this is a summer problem.
  • Sweat left sitting in the fold after exercise or a hot day.
  • Thick moisturizers and ointments used on their own. They keep the fold wet, which is the opposite of what it needs.
  • A steroid cream used alone for more than a few days. It settles the redness while the yeast underneath keeps growing, so the rash often looks better for a week and then worse than before. Strong steroids also thin fold skin faster than skin anywhere else on the body.
  • Tight, synthetic, non-breathable clothing, and seams that sit in the crease.
  • Talcum powder that clumps. Damp powder turns into a gritty paste that abrades the skin further.
  • Blood sugar running high, which makes yeast overgrowth easier.
  • Incontinence, and any dressing or brace that traps moisture against a fold.

Daily Habits That Help

  • Dry the fold properly. Pat rather than rub, then let it air for a few minutes or use a hairdryer on the cool setting. This one step does more than anything you can buy.
  • Keep the surfaces apart. A strip of soft cotton, a moisture-wicking liner, or a purpose-made fold liner in the crease stops skin rubbing on skin and pulls moisture away.
  • Use a barrier. Zinc oxide paste is the standard. It repels moisture instead of holding it, and it takes the friction.
  • Treat the yeast rather than hoping. An antifungal cream or powder, used for two to four weeks, is usually what actually clears it.
  • Antiperspirant in the fold. Applied to clean, dry skin at night, an aluminium-based antiperspirant reduces sweating there. It is a legitimate treatment, not a workaround.
  • Loose, breathable clothing, and getting out of damp clothes promptly.
  • Losing weight where that is realistic, which reduces the depth of the folds themselves.
+1 more
  • Keep going after it looks clear. Most recurrences are people who stopped on day four.

Try at Home

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Most intertrigo clears with drying, a barrier and an over-the-counter antifungal used for long enough. The order matters: dry first, then barrier or antifungal, never a plain moisturizer on its own.

Always
Wash the fold with a mild, fragrance-free cleanser, rinse well, then dry it properly — pat, do not rub, and give it a few minutes of air or a hairdryer on the cool setting. The drying is the part that matters, and it does more than anything you can buy.
Always
A strip of soft, moisture-wicking fabric placed in the crease keeps the two skin surfaces apart and pulls sweat away. Purpose-made fold liners exist, and plain cotton works too. This is one of the few things that treats the actual cause.
Always
The standard barrier for a fold. It repels moisture rather than holding it in, which is the opposite of what a plain moisturizer does, and it takes the friction instead of your skin. Apply after the fold is fully dry.
Clotrimazole cream
Strong evidence
An over-the-counter antifungal that works against Candida, which is the yeast that usually moves into an intertrigo fold. Apply twice a day and keep going for two weeks after it looks clear — stopping early is why it comes back.
Strong evidence
Works the same way as clotrimazole against yeast, and the powder version is genuinely useful in a fold because it treats and dries at the same time. Apply to skin that is already dry.
Moderate evidence
Applying an aluminium-based antiperspirant to a clean, dry fold at night reduces how much it sweats, which is treating the cause rather than the rash. It is a legitimate step, not a hack. Do not put it on broken or raw skin.
Limited evidence
Useful for a few days if the fold is very sore and inflamed, and best used alongside an antifungal rather than instead of one. On its own it settles the redness while the yeast keeps growing, which is why so many people find the rash comes back worse. Fold skin also thins quickly, so keep it short.
Limited evidence
Sold widely as an antifungal foot powder, and it is drying, which helps. Be aware of the gap: tolnaftate works on ringworm-type fungi but not reliably on Candida, which is the yeast usually involved here. If the fold has satellite spots, choose clotrimazole or miconazole instead.
Limited evidence
For a fold that is weeping or oozing. A cool compress for fifteen minutes, two or three times a day, dries the surface and calms it enough for the antifungal to work.

When to See a Dermatologist

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Mild intertrigo often settles with drying, a barrier cream and an over-the-counter antifungal. Book a visit if:

  • Two weeks of proper care has not cleared it.
  • It weeps, crusts, smells, or is painful rather than just sore.
  • It keeps coming back in the same fold.
  • The skin is splitting or bleeding in the crease.
  • You have diabetes, or you have never been tested and this keeps recurring.
  • It has spread beyond the fold, or you feel unwell.

What the visit gets you: a scraping to confirm whether yeast is actually involved, a swab if bacteria are, a check for erythrasma — which looks almost identical and needs a completely different treatment — and a steroid weak enough to be safe in a fold combined with the right antifungal, rather than one or the other.

What Happens at the Dermatologist?+

Intertrigo is recognised by looking, but a few quick tests genuinely earn their place here, because three different organisms cause a similar-looking fold rash and they are not treated the same way.

A KOH scraping takes a few flakes from the edge of the rash and looks at them under a microscope after a drop of potassium hydroxide dissolves the skin cells. It shows yeast or fungus within minutes. It matters because a fold rash treated as eczema, when it is actually Candida, will not clear.

A bacterial swab is worth taking where the fold is weeping, crusted or smells. It identifies the bacteria and shows which antibiotic will work.

A Wood's lamp is a handheld ultraviolet light held over the fold in a darkened room. Erythrasma, a mild bacterial infection that looks very like intertrigo, glows coral-red under it. That result changes the treatment completely, from an antifungal to an antibiotic.

A biopsy is rarely needed, and only for a fold rash that responds to nothing and might be something else entirely.

Prescription Treatments

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For folds that keep weeping, keep coming back, or need both an antifungal and something to settle the inflammation without thinning the skin.

Topical prescriptions
Nystatin cream or powder
Strong evidence
A prescription antifungal aimed specifically at Candida, which is what usually colonises a fold. The powder is often the better choice, because it treats the yeast and dries the fold at the same time. It does nothing for ringworm-type fungus.
Topical prescriptions
Strong evidence
A broader prescription antifungal that covers both yeast and ringworm-type fungus, which is useful when it is not clear which one you are dealing with. Once daily for two to four weeks.
Topical prescriptions
Moderate evidence
Often chosen for folds because it covers yeast and fungus and also has some activity against bacteria, and intertrigo frequently has more than one organism in it. Once a day.
Topical prescriptions
Moderate evidence
A mild prescription steroid safe enough for fold skin, used for about a week alongside an antifungal when the fold is very inflamed. It is a short-term addition, never the whole treatment.
Topical prescriptions
Moderate evidence
For a fold that has become genuinely infected with bacteria — weeping, yellow crusting, or a smell. It treats the bacteria only, so it is used alongside the antifungal rather than instead of it.
Topical prescriptions
Moderate evidence
This is the treatment for erythrasma, the bacterial mimic that looks almost exactly like intertrigo and glows coral-red under a Wood's lamp. If your fold rash has never responded to antifungals, this is often the reason why.
Pills and injections
Moderate evidence
A tablet used when the yeast is widespread across several folds, or when creams have not worked because the area is too large or too wet to treat properly. Usually a short course. It does not replace the drying and barrier work.
Pills and injections
Moderate evidence
For a fold that has developed a real bacterial infection spreading beyond the crease, or genuine cellulitis. Not for an ordinary intertrigo, and not a substitute for treating the yeast and the moisture.

What to Expect

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Step 1
The first few days

Drying, a barrier and an antifungal together take the raw, stinging feeling down quickly. Comfort improves before appearance does.

Step 2
One to two weeks

The redness and the satellite spots fade. This is where most people stop, and it is too early.

Step 3
Two to four weeks

Keep the antifungal going to the end of the course even when the fold looks normal. Yeast is still present after the rash has gone, and stopping early is the most common reason it comes straight back.

Step 4
After it clears

The habits are the treatment now: dry the fold every day, keep a liner or barrier in place, change out of damp clothing. This part is permanent if your folds are permanent.

Step 5
Marks left behind

Folds are often left darker than the surrounding skin. It is pigment from the inflammation, not scarring, and it fades over weeks to months.

Step 6
The honest long view

Intertrigo is very treatable and very repeatable. The rash clears reliably. Whether it returns depends almost entirely on moisture control, which is a daily habit rather than a course of cream.

Complications

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Intertrigo is uncomfortable rather than dangerous, but leaving it alone or treating it wrongly causes problems.

Secondary infection
Broken, damp skin is easily infected by bacteria as well as yeast. Weeping, yellow crust, a smell, or increasing pain point that way.
Cellulitis
Uncommon, but a genuine infection can spread into the deeper tissue, causing hot, tender, spreading redness and feeling unwell. That needs oral antibiotics.
Skin thinning from steroids
Fold skin is thin already and absorbs far more of a steroid than skin elsewhere. Strong steroids used for weeks in a fold can leave the skin fragile, shiny and marked with stretch marks.
Cracks and splits
Deep fissures in a crease are painful, slow to heal, and an easy entry point for infection.
Colour changes
Darker or lighter patches after the rash settles, most noticeable on brown and Black skin. These fade.
Something else underneath
Repeated, stubborn intertrigo is sometimes the first sign of undiagnosed diabetes. It can also turn out to be inverse psoriasis or hidradenitis suppurativa that has been treated as a simple fold rash for years. That is a reason to have it looked at rather than a reason to worry.

Lookalikes

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Several rashes live in skin folds and look similar. They are treated differently, so it is worth telling them apart.

  • Erythrasma — a mild bacterial infection. Flatter, browner, finely wrinkled and less sore than intertrigo. It glows coral-red under a Wood's lamp, and it needs an antibiotic rather than an antifungal.
  • Inverse psoriasis — smooth, shiny, sharply edged patches in the folds with no scale, because the moisture rubs it away. Usually there are psoriasis clues elsewhere, such as the nails or scalp.
  • Jock itch (tinea cruris) — a fungal infection with a raised, scaly, advancing edge and clearer skin in the middle. It spreads onto the inner thighs and usually spares the scrotum.
  • Contact dermatitis — a reaction to a deodorant, wipe, pad or fabric. Shaped like whatever touched the skin rather than following the crease.
  • Seborrheic dermatitis — greasy, salmon-coloured flaking in the groin, armpits and under the breasts, most often in babies and older adults.
  • Hidradenitis suppurativa — painful deep lumps, boils and tunnels in the armpits and groin that recur in the same spots and leave scars. A very different problem, often mistaken for stubborn intertrigo for years.
  • Scabies — intense itch, worse at night, usually shared with someone in the household, and typically also between the fingers and around the waist.

The mirror-image shape and the satellite spots are the best signs that you are looking at intertrigo with yeast on top.

FAQ+
Is intertrigo a fungal infection?Not to begin with. It starts as friction and trapped moisture. Yeast, usually Candida, then grows on top very often, which is why antifungal treatment is usually part of the answer.
What are the little spots around the edge?Satellite lesions — separate small spots just outside the main patch. They are the most useful sign that yeast is involved.
Why did a steroid cream make it worse?A steroid calms the redness but does nothing to the yeast, which keeps growing underneath. It often looks better for a week and then worse than it started. In folds, strong steroids also thin the skin quickly.
Can I just use moisturizer?That usually makes it worse. The fold is already too wet. A barrier product like zinc oxide repels moisture; a moisturizer holds it in.
Is intertrigo contagious?No. The yeast and bacteria involved already live on normal skin.
Is powder a good idea?A dry antifungal powder can help. Plain talc clumps into a damp paste that rubs the skin raw, so it is not a reliable choice.
Can I use antiperspirant in a skin fold?Yes. Applied to clean, dry skin at night, an aluminium-based antiperspirant reduces sweating in the fold. It is a legitimate part of treatment.
How long does it take to clear?Comfort improves within days. Clearing usually takes one to two weeks, and an antifungal is generally continued for two to four weeks so it does not come straight back.
Why does mine keep coming back?Because the fold is still there and still damp. Recurrence is about moisture control, not about the cream failing.
Does intertrigo mean I have diabetes?No, but there is a link. High blood sugar makes yeast overgrowth easier, and repeated stubborn intertrigo is occasionally what leads to a diabetes diagnosis. It is reasonable to have blood sugar checked if this keeps happening.
Can babies get it?Yes. Neck folds, thigh creases and the nappy area are common, and nappy rash is often intertrigo with Candida on top.
Will it leave a scar?No. It can leave the fold darker for weeks to months, especially on brown and Black skin, but the colour evens out.