By Dr. Shweta Lamba Narula,
The short answer: Fungal acne (Malassezia folliculitis) is not caused by the same bacteria as regular acne. It's an overgrowth of Malassezia yeast, which thrives on fatty acids and proliferates in hot, humid, sweaty conditions. In one retrospective study, 83% of Malassezia folliculitis patients worked in warm environments and 71% said sweating worsened their breakouts, making India's July-September monsoon season peak risk time. A dermatologist-confirmed diagnosis and antifungal treatment (not regular acne products) is required to clear it.
You've been diligently using your acne cleanser. Your salicylic acid serum has barely touched the shelf. You switched to a "non-comedogenic" moisturiser months ago. And yet, those small, maddeningly itchy bumps across your upper back and chest just won't budge, or worse, they've multiplied.
Here's the thing: if regular acne treatments aren't working, there's a good chance your skin isn't dealing with regular acne. It might be Malassezia folliculitis, colloquially called "fungal acne", and July through September in India is exactly when it loves to show up uninvited.
This is not a rare, exotic skin condition. It's one of the most commonly misdiagnosed skin issues in India, and the humid months are its favourite playground. Let's actually understand what's happening in your follicles.
What is fungal acne and how is it different from regular acne?
The name "fungal acne" is a bit of a misnomer that stuck because of how it looks, not because of what it is. Clinically, it's called Malassezia folliculitis: an infection of hair follicles caused by Malassezia, a genus of lipophilic (fat-loving) yeast that naturally lives on everyone's skin.
Yes, everyone. Malassezia is part of your skin's normal microbiome. The colonisation rate in humans can reach as high as 98%. Under normal circumstances, it doesn't cause trouble. But when conditions shift, more sebum, more sweat, more occlusion, more humidity, this yeast proliferates inside hair follicles and triggers an inflammatory response that looks almost exactly like acne.
Regular acne (acne vulgaris) is driven by a different organism entirely: Cutibacterium acnes, a bacterium. The two conditions look similar enough that dermatologists routinely see fungal acne patients who've been on antibiotics or acne medications for months with zero improvement, and in some cases, the antibiotics actually make fungal acne worse by wiping out competing bacteria and giving Malassezia more room to overgrow.
The visual clue that separates them:
Fungal acne presents as small, uniform, itchy papules and pustules. They're all roughly the same size, concentrated on the upper back, chest, and sometimes the hairline. There are no blackheads. No whiteheads. No deep cysts. Just rows of nearly identical little bumps.
Regular acne is polymorphic, a mixture of sizes, depths, and types. You get some comedones, some papules, maybe a cyst here and there. That variety is actually one of its diagnostic hallmarks.
The other big tell: itching. Malassezia folliculitis is pruritic in the majority of cases, around 80%, per clinical data. Standard acne doesn't usually itch. If your "acne" is making you want to scratch your back on a doorframe, that's a meaningful signal.
Why does Malassezia suddenly overgrow? The fatty acid connection
Malassezia is a lipophilic organism. It cannot synthesise its own long-chain fatty acids, so it has to pull them from your skin. It feeds specifically on medium-to-long-chain fatty acids (C11-C24 carbon chain length), including lauric, myristic, palmitic, stearic, and oleic acids. These are naturally present in sebum, which is why sebaceous-rich zones, chest, upper back, scalp, hairline, are the primary battlegrounds.
When Malassezia proliferates beyond normal levels, its potent lipases (enzymes that break down fats) hydrolyse triglycerides in the sebum into free fatty acids. This alters the follicular environment, promotes hyperkeratinisation (the follicle gets blocked), and triggers TLR-2 immune receptors on keratinocytes, releasing pro-inflammatory cytokines like IL-8 that cause the redness and swelling you see.
It's worth noting: the "avoid all fatty acids" rule in skincare is based on in vitro (lab) data. Real skin is a more complex environment. But it remains a sensible, evidence-informed precaution to avoid heavy fatty-acid-rich oils (coconut, olive, sunflower) in your routine if you're prone to Malassezia flares, particularly during humid months.
Why monsoon season in India is Malassezia's prime time
If you've noticed your bumps getting noticeably worse every year from July through September, you're not imagining it. The monsoon creates almost ideal conditions for Malassezia overgrowth.
Malassezia globosa, the species most commonly implicated in folliculitis, grows most actively in conditions of high temperature and elevated sweat compounds. A 2012 study in the Journal of Dermatology found that M. globosa growth was specifically promoted by sweat compounds and higher temperatures, unlike other cutaneous Malassezia species.
In clinical studies on Malassezia folliculitis patients, 83% reported working in warm environments and 71% said that sweating was an aggravating factor. The DermNet clinical reference lists hot humid climate, hyperhidrosis (excessive sweating), and occlusion from emollients and sunscreens as the top risk factors for the condition.
During monsoon months in India, you're sweating under damp clothes that stay damp. Humidity levels in cities like Mumbai, Chennai, Kolkata, and Bengaluru regularly exceed 80-90%. Wet fabric against skin creates the exact occlusive, warm, moist environment that lets Malassezia yeast colonise follicles en masse.
Add to this: you may be layering on heavier moisturisers or sunscreens with occlusive ingredients, carrying a backpack (back and chest: the primary affected zones), or working in air-conditioned offices that dehydrate skin and prompt you to apply more emollients, then stepping outside into humid heat. Every one of these behaviours can be a contributing factor.
What ingredients in your routine might be feeding it
This is where fungal-acne-prone skin gets complicated, because several popular skincare ingredients, ones that are perfectly fine for most people, can theoretically feed Malassezia by providing the fatty acids it subsists on.
Ingredients that commonly come up in the literature as potentially problematic include: coconut oil, olive oil, flaxseed oil, sunflower seed oil, argan oil, marula oil, anything with high concentrations of oleic, linoleic, lauric, or myristic acid chains. Rich, occlusive face butters (shea, cocoa) are in this category too.
It's important to be honest about the evidence level here: the original Malassezia fatty acid data comes from in vitro studies, and controlled human trials on specific cosmetic ingredient avoidance are limited. What practitioners generally advise is conservative: if you're in a known flare, streamline your routine and avoid complex botanical oils until things settle.
Ingredients that are generally regarded as safe for Malassezia-prone skin:
- Glycerin
- Hyaluronic acid
- Niacinamide
- Zinc PCA
- Squalane (this is debated; some sources flag it, but squalane is a hydrocarbon rather than a fatty acid ester and the evidence for it feeding Malassezia is weak)
- Centella asiatica extract
- Most silicones
When choosing a sunscreen, non-negotiable in Indian UV conditions, look for formulas built around niacinamide, hyaluronic acid, or zinc-based filters without heavy oil bases.
What tea tree oil and niacinamide can actually do (and what they can't)
Tea tree oil has in vitro antifungal evidence. A 1997 study showed the susceptibility of Malassezia furfur (a related species) to Melaleuca alternifolia (tea tree) essential oil, and later research identified terpinen-4-ol, tea tree's primary active compound, as having strong inhibitory effects on Malassezia's phospholipase activity. At a 5% concentration in a wash-off cleanser, tea tree has been used as part of mild Malassezia management. It's not a stand-alone treatment, but it's a rational skincare step while you address the condition properly.
Niacinamide is not antifungal. It won't kill Malassezia. But it addresses several of the downstream problems that make fungal acne worse: it reduces sebum production (clinical studies show meaningful sebostatic effects at 2-5%) and inhibits pro-inflammatory cytokines including TNF-alpha, IL-1, IL-6, and IL-8, the exact mediators involved in Malassezia's inflammatory response. This means niacinamide can reduce the severity and redness of fungal acne bumps even though it doesn't treat the root cause. Think of it as reducing the fire while you address the fuel.
How to adapt your routine during monsoon months
The monsoon asks for a lighter, more breathable approach to skincare, especially if you have a history of fungal breakouts.
Cleanse with something that keeps the scalp and follicular zone clean. A gentle antifungal wash helps. Look for cleansers with tea tree oil or zinc-based formulas for the chest and back. The Pilgrim Tea Tree Purifying Gel Face Wash (Rs. 250, 100ml) uses tea tree's antifungal properties in a non-comedogenic, wash-off formula, lightweight enough for the humid season and formulated without the heavy oils that can feed Malassezia.
Control oil, not with more products, but with smarter ones. The Pilgrim 10% Niacinamide Face Serum with 1% Zinc PCA (Rs. 649, 30ml) pairs niacinamide's sebostatic action with zinc PCA, a form of zinc that regulates sebaceous activity and has mild anti-inflammatory properties. Less sebum means less substrate for Malassezia to hydrolyse. This combination also helps fade the post-inflammatory marks that tend to linger long after the bumps themselves resolve.
Choose your sunscreen very carefully. Many sunscreens are built on fatty-acid-rich emollient bases, which is fine for most skin types, but potentially aggravating for Malassezia-prone skin. The Pilgrim 5% Niacinamide Hydra Glow Gel Sunscreen SPF 50+ PA++++ (Rs. 495, 50ml) is a gel-based SPF 50+ formula with a niacinamide base and no heavy fatty acid-loaded oils. It gives you full UV protection without the greasy, occlusive finish that creates the warm, sealed environment Malassezia prefers. In India's year-round UV conditions, skipping sunscreen is not an option; finding one that works with Malassezia-prone skin is.
Beyond products: wear breathable, loose-fitting cotton in monsoon months. Change out of damp workout clothes quickly. Pat-dry thoroughly after every shower. Carry a travel-sized version of your face wash if you sweat heavily through the day.
When to see a dermatologist
This section matters. If you've tried an adjusted routine, antifungal-safe products, lighter layers, breathable clothing, for 4-6 weeks with no improvement, or if your breakouts are spreading, intensifying, or causing significant discomfort, see a dermatologist.
Fungal acne diagnosis should ideally be confirmed rather than self-treated. A dermatologist can perform a KOH examination (potassium hydroxide preparation of pustule content) or a dermoscopy to confirm Malassezia folliculitis. This is important because several other conditions, steroid acne, bacterial folliculitis, eosinophilic folliculitis, can look similar and require entirely different treatments.
For confirmed Malassezia folliculitis, topical antifungal formulations (including ketoconazole shampoo used as a body wash) are frequently prescribed. In extensive or persistent cases, oral antifungals like itraconazole or fluconazole may be recommended. These are medical decisions that require a diagnosis, not a DIY protocol. A 2024 position statement from the European Academy of Dermatology and Venereology recommends clinical confirmation before initiating antifungal therapy.
Frequently asked questions
Is fungal acne actually acne?
No. Fungal acne, correctly called Malassezia folliculitis, is caused by an overgrowth of Malassezia yeast in hair follicles, not by the Cutibacterium acnes bacteria responsible for regular acne. The two conditions require different treatments, which is why standard acne products often have no effect on fungal acne.
How do I know if I have fungal acne or regular acne?
The key differences: fungal acne presents as small, uniform, itchy papules and pustules with no blackheads or whiteheads, all bumps are roughly the same size. Regular acne is more varied, with comedones, papules of different sizes, and sometimes cysts. Fungal acne also tends to itch, while regular acne generally doesn't. A dermatologist can confirm with a simple skin scraping exam.
Why does my back and chest break out more in July and August?
The upper back and chest are the body's most sebaceous areas outside the face, and Malassezia feeds on the fatty acids in sebum. July-September in India brings high humidity, heavy sweating, and damp clothing that stays close to the skin. All three create the warm, occluded, sebum-rich environment where Malassezia yeast proliferates fastest.
Can I treat fungal acne with ketoconazole shampoo at home?
Ketoconazole shampoo is sometimes used as a wash-off antifungal treatment for Malassezia folliculitis, but it's a prescription or pharmacist-recommended product that should be used under dermatological guidance, not self-initiated without a diagnosis. If you suspect fungal acne, consult a dermatologist for confirmation and a treatment plan.
Is coconut oil bad for fungal acne?
Coconut oil is very high in lauric acid and other medium-chain fatty acids that Malassezia uses as a food source in laboratory conditions. While human skin is more complex than a petri dish, it's a practical and dermatologist-supported recommendation to avoid applying coconut oil (or other heavy botanical oils) to areas prone to Malassezia folliculitis, especially during high-humidity months.
Can niacinamide treat fungal acne?
Niacinamide is not antifungal and won't eliminate Malassezia. What it does is reduce sebum production and calm the inflammatory response, which makes the environment less hospitable for Malassezia overgrowth and reduces the redness and irritation of existing bumps. It's a supportive skincare step, not a primary treatment.
Will my regular SPF make fungal acne worse?
Some sunscreens use heavy emollient or oil-rich bases that can theoretically aggravate Malassezia-prone skin through occlusion and fatty acid content. Switching to a lightweight, gel-based SPF 50 formula built on niacinamide or zinc rather than heavy oils can make a noticeable difference, and you still get full UV protection.
Does fungal acne come back after treatment?
Yes, recurrence is one of the defining features of Malassezia folliculitis. Maintenance with periodic antifungal washes (typically once or twice a week), routine control of oil and sweat, and careful ingredient choices during high-humidity months can significantly reduce how often flares happen. A periodic re-evaluation with a dermatologist is advisable if breakouts keep returning each monsoon.
Can I wear makeup over fungal acne?
Many conventional foundations and primers contain oils and fatty acid-rich emollients. If you're actively flaring, it's worth checking your makeup ingredients the same way you'd check skincare, look for "non-comedogenic" and "oil-free" claims, and minimise coverage over the affected chest/back areas since occlusion makes things worse.
Will it spread to other people?
No. Malassezia folliculitis is not contagious. Malassezia yeast is a normal part of human skin flora; the overgrowth is a personal reaction to individual sebum levels, immunity, and environmental conditions, not something you can transmit.
References
1. Martinez-Ortega JI, Mut Quej JE, Franco Gonzalez S. Malassezia folliculitis: pathogenesis and diagnostic challenges. Cureus. 2024;16(11):e73429. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11633069/
2. DermNet NZ. Malassezia (pityrosporum) folliculitis. Updated May 2024. https://dermnetnz.org/topics/malassezia-folliculitis
3. Akaza N, Akamatsu H, Sasaki Y, et al. Malassezia globosa tends to grow actively in summer conditions more than other cutaneous Malassezia species. J Dermatol. 2012. https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1346-8138.2011.01477.x
4. Rolfe HM. A review of nicotinamide: treatment of skin diseases and potential side effects. J Cosmet Dermatol. 2014. https://deepblue.lib.umich.edu/bitstreams/37bc8823-cc14-471f-94f2-8ef31e5fe4cc/download
5. Carson CF, Hammer KA, Riley TV. Melaleuca alternifolia (tea tree) oil: a review of antimicrobial and other medicinal properties. Clin Microbiol Rev. 2006;19(1):50-62. https://journals.asm.org/doi/full/10.1128/cmr.19.1.50-62.2006
6. Vlachos C, Henning MA, Gaitanis G, Faergemann J, Saunte DM. Critical synthesis of available data in Malassezia folliculitis and a systematic review of treatments. J Eur Acad Dermatol Venereol. 2020. https://www.frontiersin.org/journals/cellular-and-infection-microbiology/articles/10.3389/fcimb.2020.00112/full
7. Paichitrojjana A, Chalermchai T. Prevalence, associated factors, and clinical characterization of Malassezia folliculitis in patients clinically diagnosed with acne vulgaris. Clin Cosmet Investig Dermatol. 2022. https://www.dovepress.com/the-prevalence-associated-factors-and-clinical-characterization-of-mal-peer-reviewed-fulltext-article-CCID
