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Fungal acne, explained.

Uniform small bumps that don't respond to standard acne treatments? The culprit is often Malassezia yeast — and it eats fatty acids. Here's what to remove from your routine.

CategorySkincare · Malassezia
Reading time5 minutes
PublishedApril 23, 2026
Last updatedMay 8, 2026
Our takeCheck Your Oils
fungal

↑ Not regular acne — different cause, different ingredients to avoid.

01 / WHATWhat fungal acne actually is.

Fungal acne (Malassezia folliculitis) is not acne. It's an overgrowth of Malassezia yeast — which normally lives on everyone's skin — in hair follicles. It presents as uniform small bumps, often on the forehead, chest, or back, and doesn't respond to standard acne treatments.

The key difference: bacterial acne varies in size. Fungal acne looks identical — small, uniform, itchy papules that resist benzoyl peroxide and salicylic acid treatments.

The fix isn't a stronger acne treatment. It's removing the food source. Malassezia feeds on fatty acids, and many popular skincare ingredients are essentially meals for it.

02 / TRIGGERSIngredients that feed Malassezia.

These ingredients are present in a huge range of popular skincare products — including many marketed as "clean," "natural," or "gentle." The issue isn't their overall safety, it's that they're Malassezia food.

IngredientVerdictWhy it triggers
Fatty acids (C11–C24)Lauric acid, palmitic acid, stearic acid, oleic acid
AVOID
Malassezia yeast feeds on medium and long-chain fatty acids. These are its primary food source.
Oils high in oleic acidArgan oil, rosehip oil, marula oil, olive oil, coconut oil
AVOID
High oleic acid content feeds Malassezia, even in 'natural' or 'cold-pressed' forms.
Fatty estersIsopropyl myristate, isopropyl palmitate, myristyl myristate
AVOID
Common emollients that Malassezia can metabolise. Very frequently found in moisturisers and sunscreens.
Fermented ingredientsGalactomyces ferment filtrate, sake, Bifida ferment lysate
CAUTION
Fermented ingredients can contain byproducts that encourage Malassezia growth.
PolysorbatesPolysorbate 20, 40, 60, 80
AVOID
Emulsifiers derived from fatty acids that can act as a food source for Malassezia.

03 / SAFEIngredients that are generally safe.

These provide hydration, barrier support, and active benefits without the oleic/fatty acid content that feeds Malassezia.

IngredientVerdictWhy it's safe
Niacinamide (Vitamin B3)Serums, moisturisers
SAFE
Anti-inflammatory, pore-minimising, and generally Malassezia-safe.
Hyaluronic acidHydrating serums
SAFE
Humectant that draws moisture into the skin without feeding yeast.
SqualaneFace oils, lightweight moisturisers
SAFE
Derived from olives or sugarcane. A rare oil that does NOT feed Malassezia.
GlycerinMoisturisers, toners
SAFE
Widely considered safe — it's a humectant, not a fatty acid.
Salicylic acid (BHA)Cleansers, exfoliants
SAFE
Exfoliates inside pores and has antifungal properties at certain concentrations.
CeramidesBarrier repair creams
SAFE
Technically fatty acids but studies suggest they're generally tolerated in fungal acne-prone skin.

04 / VERDICTThe bottom line.

Remove Oils FirstSketchy Labels take

Audit your moisturiser, sunscreen, and any leave-on treatments.

These are the highest-risk products. Cleansers matter less since they're rinsed off. Look for fatty esters (isopropyl myristate is a big one) and oleic-acid-heavy oils. Switch to squalane, glycerin-based, and niacinamide-heavy products and give it 4–6 weeks.

If you're not sure whether a product is fungal acne safe, check each ingredient against the trigger list above. The ingredients panel doesn't distinguish between 'safe' and 'triggering' — you have to read it yourself.

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