Fungal Acne: How to Tell Malassezia Folliculitis From Acne

“Fungal acne” isn’t acne at all. It’s Malassezia (Pityrosporum) folliculitis, an overgrowth of a yeast that normally lives on skin, inside hair follicles. It looks like a breakout but tends to be itchy, made of small bumps that all look the same, with no blackheads or whiteheads, mostly on the chest, back and shoulders. Because it’s caused by yeast, antibiotics don’t help and can make it worse; antifungal treatment does. If your “acne” fits that description, ask a clinician about a simple skin-scraping test.

What is fungal acne (Malassezia folliculitis)?

DermNet defines Malassezia folliculitis as an infection of the hair follicle and oil gland (the pilosebaceous unit) caused by oil-loving Malassezia yeasts, particularly M. globosa, M. sympodialis and M. restricta. The older name, Pityrosporum folliculitis, refers to the same thing.

These yeasts aren’t invaders. A 2014 review in the Journal of Clinical and Aesthetic Dermatology notes that Malassezia is part of the normal skin flora in 75% to 98% of healthy people. Problems start when the yeast overgrows inside follicles: it breaks down the triglycerides in sebum into free fatty acids that it uses as food, and multiplies. That’s why it’s more common in oily, sweaty skin.

DermNet says it’s most common in adolescent and young adult males. Recognised triggers include:

• Heat and humidity, and heavy sweating (DermNet)
• Occlusion: tight clothing and heavy topical products such as makeup, lotions or sunscreens may promote flares
• Antibiotics, particularly tetracyclines, which are also common acne treatments (Rubenstein and Malerich)
• Oral corticosteroids and immunosuppression, including HIV infection (DermNet)

How is fungal acne different from regular acne?

Acne vulgaris starts with a clogged pore. According to StatPearls, the microcomedo is the precursor of every acne lesion, so true acne usually comes with a mix of comedones, red bumps and pustules. Malassezia folliculitis looks different:

• It itches. The 2014 review describes intensely itchy, 1 to 2 mm, uniform (monomorphic) bumps and pustules. A 2025 review in the Journal of Fungi reports itch in 65% and 71% of patients in two separate groups studied. Ordinary acne usually isn’t itchy.
• The bumps all look alike. Acne tends to have spots at different stages; MF is a crop of near-identical small bumps.
• No blackheads or whiteheads. DermNet notes the eruption has no comedones, which helps distinguish it from acne vulgaris. The 2025 review adds that nodules and cysts are absent too.
• Location. It favours the upper back, chest and shoulders, sometimes the forehead, neck and upper arms. StatPearls describes a cape-like distribution over the shoulders, back and neck.
• Antibiotics don’t help. The 2014 review lists lack of response to oral and topical antibiotics as a clue, and StatPearls says clinicians should be suspicious when acne has worsened after antibiotic treatment.

To complicate things, you can have both. The 2014 review cites studies where 27% and 12.2% of people with MF also had acne vulgaris. For truncal breakouts more broadly, see back acne.

How is fungal acne diagnosed?

Usually with a quick, painless test. The standard approach is a KOH preparation: a clinician gently scrapes the surface of a bump, adds potassium hydroxide and looks under a microscope. DermNet says this may reveal budding yeasts, and a Wood’s lamp (UV light) may show yellow-green fluorescence. A skin biopsy showing yeast within the follicles is the most definitive option.

None of these tests is perfect. The 2025 Journal of Fungi review reports a KOH sensitivity of 81.6% and a Wood’s lamp sensitivity of 66.7% in individual studies. It also notes that because Malassezia lives on healthy skin, simply growing it in a culture doesn’t prove it’s causing the problem. That’s why diagnosis combines the pattern on your skin, your history (recent antibiotics? hot climate? heavy products?) and testing.

Misdiagnosis is common. The 2014 review calls MF easy to miss and likely underdiagnosed, and the 2025 review cites a study in which 75% of patients had previously been treated for acne without success. The AAD also notes that folliculitis in general can look like a sudden acne breakout, which is one reason to have a dermatologist confirm what you’re dealing with.

What does the evidence say about antifungal treatment?

Let me be upfront: the evidence base is small. The 2025 review found most studies were small case series or retrospective analyses, with only one randomised controlled trial identified (oral itraconazole versus placebo). Here’s what exists.

Oral antifungals

That one trial, published by Parsad and colleagues in the Indian Journal of Dermatology, Venereology and Leprology in 1999, randomised 26 people with lab-confirmed Pityrosporum folliculitis to itraconazole 200 mg once daily for 7 days or placebo. At follow-up, 84.6% on itraconazole were healed or markedly improved, compared with 8.3% on placebo. It’s an encouraging result, but from a very small study.

StatPearls says oral antifungals are often the treatment of choice, because they can reach deeper into the follicle than creams. It names itraconazole and fluconazole as the preferred options: itraconazole has more supporting evidence, while fluconazole is often chosen because it’s better tolerated. DermNet frames oral treatment as the option for resistant cases. Either way, these are prescription medicines, and the choice and dose are for your clinician.

One important safety note: oral ketoconazole tablets are not a reasonable option here. The FDA label carries a boxed warning about serious liver injury, including deaths and liver transplants, restricts the tablets to serious systemic fungal infections when other drugs aren’t suitable, and says they aren’t approved for skin fungal infections. Ketoconazole creams and shampoos applied to the skin are a different matter.

Topical antifungals

DermNet says topical antifungals such as selenium sulfide, econazole and ketoconazole are typically effective. The 2025 review summarises small studies reporting 80% to 88% recovery with selenium disulfide 2% shampoo over 4 to 8 weeks, and clinical improvement after an average of about 27 days with ketoconazole 2% cream, versus about 14 days with oral itraconazole. Topicals tend to be slower than tablets, but DermNet positions them first, with oral treatment for resistant cases, and they’re the mainstay of maintenance.

Expect it to come back

Relapse is the rule rather than the exception. The 2014 review says recurrence is common and recommends topical antifungals for maintenance and prevention. In one series cited in the 2025 review, 25% relapsed, usually within 4 months, while 75% stayed clear at 6 months with maintenance ketoconazole shampoo. DermNet suggests long-term topical prophylaxis for people at high risk or with repeated flares.

Can you prevent fungal acne?

You can reduce the odds by tackling known triggers from the sources above:

• Shower and change out of sweaty clothes promptly after exercise or hot weather. The AAD lists hot, damp conditions and tight clothing among causes of folliculitis generally.
• Choose lighter, less occlusive products on affected areas, since heavy lotions, makeup and sunscreens may promote flares. My guide to moisturizer and sunscreen for acne covers lighter options.
• If you’ve been on antibiotics for “acne” that isn’t improving or is getting itchier, say so. That history is a genuine diagnostic clue.

Be wary of online “fungal-acne-safe” ingredient lists. I couldn’t find clinical studies testing whether following those lists prevents MF, so treat them as unproven.

Frequently asked questions