Skin questions
Is it fungal acne or regular acne?
“Fungal acne” is not acne: it is a yeast infection of hair follicles that looks like small, uniform, itchy bumps on the chest, back or forehead, worsens with sweat and antibiotics, and clears with antifungals.
- Malassezia folliculitisMany same-sized itchy bumps on chest, back or forehead
- AcneMixed blackheads, whiteheads and red spots, mostly on the face
- Get it confirmedAntifungals for one, retinoids and benzoyl peroxide for the other
On this pageWhat “fungal acne” actually is4
Quick answer
The bottom line
Suspect Malassezia folliculitis, the condition sold as “fungal acne”, when you have many small bumps of the same size, often itchy, clustered on the chest, back, shoulders, hairline or forehead, that got worse in heat, under tight clothes or after a course of antibiotics, and that acne products have not touched. Ordinary acne has a mix of blackheads, whiteheads and larger red spots, mostly on the face, and rarely itches. The two are treated differently: the yeast responds to antifungals such as ketoconazole shampoo used as a wash and, for stubborn cases, oral antifungal tablets from a clinician, while acne antibiotics can make it worse. Get it confirmed rather than guessing, because the treatments pull in opposite directions.
At a glance
Three things worth remembering
Section 01
What “fungal acne” actually is
The condition behind the name is Malassezia folliculitis: an overgrowth of Malassezia, a yeast that lives on everyone’s skin, inside hair follicles. The follicles become inflamed and produce small bumps and pustules. It is not acne, which is driven by blocked pores, oil and a bacterium, and it does not respond to acne treatments; antibiotics that kill acne bacteria can let the yeast flourish and make it worse.[1][2]
It is common in warm, humid climates, in people who sweat heavily or wear tight synthetic clothing, after courses of antibiotics or steroids, and in people with oily skin or weakened immunity. Because Malassezia also causes dandruff and seborrhoeic dermatitis, people often have those at the same time.[2][1]
Section 02
Telling it apart from acne
Malassezia folliculitis produces many small bumps of the same size, often with a tiny pustule on top, in crops on the chest, back, shoulders, upper arms, hairline or forehead. It frequently itches. There are no blackheads, because the follicles are not blocked in the way acne pores are. Acne, by contrast, shows a mix of lesion types, blackheads, whiteheads, larger red papules and sometimes deep cysts, mostly on the face and jaw, and it does not usually itch.[2][4]
The history helps as much as the look: a rash that appeared or worsened after antibiotics, in hot weather, after a gym habit or under occlusive clothing, and that has ignored benzoyl peroxide and retinoids for weeks, points to the yeast. A clinician can confirm it by examination and, if needed, a skin scraping examined under a microscope. Both conditions can be present at once.[1][2]
Section 03
How it is treated
Treatment targets the yeast. A common first step is a ketoconazole 2% shampoo or a selenium sulfide shampoo used as a body wash on the affected areas, left on for several minutes before rinsing, several times a week. The best trial evidence for these antifungals comes from seborrhoeic dermatitis, a related Malassezia condition, where a Cochrane review found ketoconazole effective compared with plain shampoo, from evidence rated low quality.[3][1]
Widespread or stubborn cases are usually treated with a short course of oral antifungal tablets prescribed by a clinician, which work faster and more reliably than washes; they carry interactions and side effects, so they are not a self-treatment. Relapse is common in the conditions that caused it, so keeping sweat-soaked clothing off quickly, showering after exercise and continuing an antifungal wash once a week afterwards all help.[1][2]
Section 04
Skincare, and when to see someone
While it is being treated, avoid heavy oils and rich occlusive creams on the affected area, because Malassezia feeds on certain fats, and avoid starting antibiotics for “acne” that has not been diagnosed. Ordinary acne care can continue on the face if you also have acne. Lists of “fungal-acne-safe” ingredients circulating online are based on that fat-feeding idea, not on trials; they are a reasonable precaution, not a treatment.[2][4]
See a clinician if the bumps itch, cluster on the trunk, appeared after antibiotics, or have not responded to six to eight weeks of proper acne treatment. Guessing wrong costs months, because the treatments for the two conditions pull in opposite directions.[1][5]
Your next step
Turn this into a practical plan
Choose the guide that best matches what you see. Each one starts with what to try, how long to wait and when to get help.