Fungal Acne (Malassezia Folliculitis)
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Fungal Acne vs Hormonal Acne
Fungal acne is not acne at all. It is a yeast that lives on everyone's skin, growing too fast inside the hair follicles. Hormonal acne is true acne, driven by oil, blocked pores and shifting hormones. The fastest way to tell them apart is itch and pattern: fungal bumps itch and are all the same size, while hormonal spots vary in size and gather on the jaw and chin.
At a glance
| The difference | Fungal Acne (Malassezia Folliculitis) | Hormonal Acne |
|---|---|---|
| What it is | Yeast overgrowing in the follicle | Pores blocked from the inside |
| What it looks like | Small bumps, all the same size | A mix of sizes |
| What it does over time | Comes back when treatment stops | Can scar |
Hormonal Acne
Side by side
The differences that matter
What it is
Fungal Acne (Malassezia Folliculitis)
Yeast overgrowing in the follicle
Malassezia yeast lives on normal skin. When it multiplies inside the follicle, the follicle becomes inflamed. It is not caught from anyone and it is not dirt.
Hormonal Acne
Pores blocked from the inside
Androgens tell the oil glands to make more oil. Oil and dead skin plug the pore. Skin bacteria multiply in the trapped oil, and the spot turns red.
How it works, illustrated
Fungal Acne (Malassezia Folliculitis)
A yeast called Malassezia lives in the openings of hair follicles on almost everyone from puberty onward. It cannot make its own fats, so it feeds on the oil the skin produces. The bacteria living alongside it, and the limited amount of oil, keep its numbers low enough to cause nothing at all.
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Malassezia yeast already lives on almost everyone's skin from puberty onward. It cannot make its own fats, so it feeds on the oil the skin produces, and it sits in the openings of hair follicles where that oil collects.
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Conditions shift in the yeast's favor. Heat, humidity, sweat held against the skin by clothing, heavy oils, or a course of antibiotics that clears the bacteria it competes with all give it room to grow.
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The yeast multiplies down inside the follicle and breaks skin oils down into fatty acids and other byproducts. This is the step every antifungal treatment is aimed at, and the step acne treatment does nothing about.
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The immune system reacts to that activity and the follicle becomes a small, red or brown, itchy bump. Every bump goes through the same process, which is why they all end up the same size. Almost everything on the lists below is pushing on one of these four steps.
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What it looks like
Fungal Acne (Malassezia Folliculitis)
Small bumps, all the same size
Tiny red or skin-coloured bumps, often in tight clusters. No blackheads. That sameness is the giveaway — the bumps look copied and pasted.
Hormonal Acne
A mix of sizes
Blackheads, whiteheads, red bumps and deep tender lumps, all on the same face at the same time.
More photographs
Fungal Acne (Malassezia Folliculitis)
Fungal acne makes small bumps that all look alike. They cluster on the forehead, chest and upper back.
Across skin tones
Fungal Acne (Malassezia Folliculitis)
Fungal acne on light skin
A sheet of small pink-red bumps, all the same size, across the shoulders and upper back — and itchy, which is the clue most people notice first. There are no blackheads and no large sore spots. It tends to flare after sweat, heavy moisturizers, or hours in a damp shirt.
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Fungal acne on medium skin
The bumps read dull pink to light brown here, so the pattern does the work: identical size, packed in a sheet rather than scattered, and itchy. Ordinary body acne is mixed — different sizes, blackheads, the odd deep sore lump — and it rarely itches. Telling those two apart is what decides whether the treatment works.
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Fungal acne on brown skin
On deeper skin tones the bumps are usually brown, violet or the same shade as the skin around them, so color is no help at all. Because of that it is more often treated as ordinary body acne, sometimes for months. That matters in practice: benzoyl peroxide, retinoids and antibiotics will not clear it, and antibiotics can make it last longer. It is an antifungal that this responds to.
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Fungal acne on deep skin
Because the bumps come in large numbers, the flat dark marks they leave can cover the whole of the shoulders and upper back, and on deeper skin tones they take six to twelve months to fade. They are post-inflammatory hyperpigmentation, not scars, and they are not permanent. Treating early, not scratching, and daily sunscreen on exposed skin are what shorten them.
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Does it itch
Fungal Acne (Malassezia Folliculitis)
Usually yes
Itch is the single most useful clue. Most people with fungal acne say the bumps itch, and that it is worse after sweating.
Hormonal Acne
Rarely
Deep spots are sore rather than itchy.
Where it shows up
Fungal Acne (Malassezia Folliculitis)
Chest, back, shoulders, upper arms
Also the forehead and hairline. It follows sweat and trapped heat, not oil.
Hormonal Acne
Jaw, chin, lower cheeks, neck
It can appear on the chest and back too, but the lower face is the pattern people recognise.
Where it appears
Fungal Acne (Malassezia Folliculitis)
Upper back, chest, shoulders and upper arms
It lands where skin is oily, warm and covered. Bumps that are all the same size and all itchy, in these areas, in someone whose acne treatment is not working, is the pattern that points to it.
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Forehead, hairline and jawline
On the face it runs along the forehead and the hairline, and it can sit on the jawline and the neck. It is uncommon on the lower face, which is where ordinary acne is usually heaviest.
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What sets it off
Fungal Acne (Malassezia Folliculitis)
Heat, sweat and antibiotics
Humid weather, sitting in damp gym clothes, heavy oily products, and courses of oral antibiotics.
Hormonal Acne
Hormone shifts
The week before a period, starting or stopping the pill, and conditions such as polycystic ovary syndrome.
What clears it
Fungal Acne (Malassezia Folliculitis)
Antifungal treatment
Ketoconazole shampoo used on the skin as a wash, left on a few minutes before rinsing. Stubborn cases need an oral antifungal for a few weeks.
Hormonal Acne
Acne treatment
Topical retinoids and benzoyl peroxide. For deeper spots, a doctor may add spironolactone or a combined pill.
What it does over time
Fungal Acne (Malassezia Folliculitis)
Comes back when treatment stops
It rarely scars. It does return, so many people keep an antifungal wash in the shower and use it once or twice a week.
Hormonal Acne
Can scar
Deep lumps left alone for weeks leave dents and dark marks. This is the reason not to wait it out.
Why acne treatments do not clear fungal acne
Fungal Acne (Malassezia Folliculitis)
Ketoconazole 1% shampoo
The main over-the-counter treatment, used as a body wash rather than for hair. Lather it over the chest, back, shoulders and hairline in the shower and leave it on several minutes before rinsing, daily for two to four weeks. Rinsing it straight off is the most common reason it seems not to work.
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Selenium Sulfide
An anti-dandruff shampoo used the same way, lathered on the affected areas and left several minutes. A reasonable alternative if ketoconazole irritates or is hard to find. It can be drying and can discolor light-colored hair, so keep it on the body.
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Pyrithione Zinc
The gentlest of the three anti-dandruff washes, and the easiest to keep using long term. It is a good choice for maintenance once the bumps have cleared, once or twice a week through the hot months. It is usually a little weaker than ketoconazole for clearing an active crop.
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Sulfur
A sulfur wash or soap has some activity against this yeast and is an option if the antifungal shampoos are not tolerated. The evidence in fungal acne specifically is thin. It smells and can be drying on the chest and back.
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Benzoyl Peroxide
It has some effect on Malassezia, which is why a few people improve partially on it and then stall. It is not the right tool here, and used as a wash it can leave the chest and back dry and irritated. If it half-works, that is a hint to switch to an antifungal wash rather than to use more of it.
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Salicylic Acid
It works by clearing blocked pores, and this is not a blocked-pore condition, so it does not act on the yeast. Some people find a wash mildly helpful for the texture. It will not clear the bumps, and scrubs and brushes usually make an irritated chest and back angrier.
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Tea Tree Oil
Widely suggested online for fungal acne and not well studied in it. It irritates inflamed skin easily, and it is a common cause of allergic reactions on the chest and back. A proven antifungal wash costs about the same and is available without a prescription.
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Itraconazole
The tablet most often used for stubborn or widespread cases, usually for one to three weeks. It clears extensive chest and back involvement far more reliably than a wash can. It interacts with a long list of other medicines, so the prescriber checks what else you take first.
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Fluconazole
The other antifungal tablet used here, often as a weekly dose for a few weeks. It suits people who cannot take itraconazole. Tablets clear the yeast but do not change the heat, sweat and occlusion that brought it on, so a maintenance wash is usually continued afterwards.
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Terbinafine
The antifungal tablet used for nail and foot infections, and it is a poor choice here. Malassezia is not reliably killed by it at the doses used by mouth. If an antifungal tablet is being considered, itraconazole or fluconazole are the ones with evidence in this condition.
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Doxycycline
An antibiotic prescribed for acne is one of the most reliable ways to make this worse, because it clears the bacteria that hold the yeast in check. A crop of itchy bumps appearing a few weeks into or after a course is a classic history. It is not a treatment for fungal acne.
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Ketoconazole 2% cream
The prescription strength, used as a cream on limited areas such as the jawline, forehead or hairline, or as a shampoo on the body. It is the usual next step when the over-the-counter 1% wash has not been enough. A cream is impractical for a whole back, which is where the wash or tablets take over.
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Clotrimazole cream
An older antifungal cream, applied twice a day to small patches. It works against this yeast and is inexpensive and widely available. Like any cream, it only suits areas you can realistically cover, so it is a jawline and hairline option rather than a chest and back one.
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Ciclopirox cream or shampoo
Another antifungal option, used when ketoconazole has irritated the skin or has not worked. There is less published evidence in Malassezia folliculitis specifically than for ketoconazole. It is used the same way, with the shampoo left on for several minutes.
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Adapalene
A retinoid works on blocked pores, and there is no plug to clear here, so it does not treat the yeast. It is often already in use because the bumps were assumed to be acne. It can stay if you also have genuine acne, but it is not what clears this.
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Clindamycin
A topical antibiotic reduces the bacteria that compete with the yeast, so at best it does nothing here and at worst the bumps get denser. Skin that gets worse rather than better on an acne antibiotic is one of the strongest clues that this is fungal acne.
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What to change while you treat it
Fungal Acne (Malassezia Folliculitis)
- Shower and change out of damp clothing soon after exercise
- Wash gym gear and pillowcases regularly
- Give heavy oils and rich balms a break on the chest and back
- Finish the full course of any antifungal, even once the bumps fade
- Expect a maintenance routine rather than a one-time cure
Related topic illustrations
Fungal Acne (Malassezia Folliculitis)
Acne
This is the mix-up that matters, because the treatments are different. Acne gives you spots of many different sizes, blackheads and whiteheads, and it rarely itches. Fungal acne gives you bumps that are all the same small size, in a sheet, with no blackheads at all, and it usually itches. Plenty of people have both at once, acne on the face and fungal acne on the chest and back.
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Keratosis Pilaris
Both give a field of small, same-sized bumps. Keratosis pilaris sits on the outer upper arms, thighs and cheeks, feels rough like sandpaper, has no pus, does not itch much, and has usually been there for years without changing. Fungal acne appears over days to weeks, itches, and can have a pinpoint of pus on top.
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Common questions
Questions Patients Ask
Is fungal acne actually acne?
No. It is an overgrowth of Malassezia yeast inside the hair follicles. It only looks like acne, which is why acne treatments do not clear it.
How do I know if my breakout is fungal?
Look for small bumps that are all the same size, no blackheads, itching, and a location on the chest, back or shoulders. A dermatologist can confirm it in one visit by looking at a skin scraping under a microscope.
Why did my acne get worse on antibiotics?
Oral antibiotics reduce the normal skin bacteria that hold the yeast in check. If bumps appear or worsen after starting an antibiotic for acne, fungal acne is a common explanation.
Can I have fungal acne and hormonal acne at the same time?
Yes, and it happens often. A common pattern is a face that responds to acne treatment while the chest and back stay bumpy and itchy.
Does fungal acne leave scars?
It usually does not. Hormonal acne is the one that scars, especially when deep lumps are left untreated for weeks.
Does fungal acne come back?
It often does once treatment stops, because the yeast is a normal resident of skin. Many people use an antifungal wash once or twice a week to keep it quiet.