Malassezia: What it is and How it Affects your Skin

If you've been researching dandruff, seborrheic dermatitis, or fungal acne, you've probably come across the word "Malassezia." It sounds alarming, but in reality it's something almost every adult already has on their skin right now, and understanding it is the first step to managing the conditions linked to it.

What Is Malassezia?

Malassezia is a genus of yeast, a type of fungus, found on the skin of the vast majority of adults and is considered a normal part of the skin microbiome, the community of microorganisms that coexist on your skin's surface.

The word "yeast" may sound concerning, but Malassezia is not inherently harmful. For most people, most of the time, it causes no problems whatsoever. It only tends to cause issues when it overgrows or behaves in ways that disrupt the skin's normal functioning.

Malassezia has been studied since the late 19th century. Early researchers identified it under different names, which is why you'll sometimes still see it referred to as Pityrosporum ovale or Pityrosporum orbiculare in older literature [1].

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Is Malassezia a Fungus or a Yeast?

Both terms are correct. Yeast is a form of fungus, specifically a single-celled type that reproduces by budding. Malassezia belongs to the kingdom Fungi and the phylum Basidiomycota, which also includes mushrooms. For practical purposes, when someone refers to Malassezia as a "yeast" or a "fungus," they mean the same thing.

The Different Species of Malassezia

There are at least 18 recognised species of Malassezia [2], but the ones most relevant to human skin are:

Malassezia globosa, the species most associated with dandruff and seborrheic dermatitis. It produces an enzyme called lipase that breaks down sebum (skin oil) into fatty acids, including oleic acid, which can irritate susceptible skin [3].

Malassezia restricta, the most common species found on the scalp and face. Like M. globosa, it feeds on fatty acids from sebum and is strongly linked to seborrheic dermatitis.

Malassezia furfur, most commonly associated with pityriasis versicolor [1] (also called tinea versicolor), a condition that causes patches of discoloured skin on the trunk, back, and shoulders.

Malassezia sympodialis, linked to atopic eczema and seborrheic dermatitis [1].

Different species are found on different areas of the body, and the balance between them can shift depending on factors like age, skin oiliness, and immune status.

Why Does Malassezia Live on Your Skin?

Malassezia is what scientists call a lipophilic organism, meaning it needs fat to survive. Unlike most fungi, it cannot synthesise its own fatty acids, so it depends entirely on the fatty acids present in sebum, your skin's natural oil.

This is why Malassezia concentrates on sebum-rich areas of the body: the scalp, face (particularly the nose, eyebrows, and ears), upper chest, and back. These are the same areas where sebaceous (oil-producing) glands are most active.

Because it relies on your skin's own oils, Malassezia has co-evolved alongside humans, usually in balance, but problems can arise when that balance is disrupted.

What Conditions Is Malassezia Linked To?

Malassezia is involved in several common skin conditions. It's important to note that in many of these, Malassezia is a contributing factor rather than the sole cause.

Dandruff

Dandruff affects around half of all adults at some point [4]. Malassezia, particularly M. globosa, plays a well-established role by breaking down sebum into oleic acid. In people with a sensitivity to oleic acid, this triggers skin cell turnover to accelerate, producing the visible white or yellowish flakes associated with dandruff. The link between Malassezia and dandruff is well studied.

Seborrheic Dermatitis

Seborrheic dermatitis is a more severe form of the same underlying process as dandruff. It causes red, scaly, greasy patches on the scalp, face (especially around the nose, eyebrows, and ears), and sometimes the chest. Malassezia is considered a key contributor, though the exact mechanisms are still being investigated. Genetic susceptibility and immune response both appear to play a role alongside Malassezia overgrowth.

Fungal Acne (Malassezia Folliculitis)

Malassezia folliculitis occurs when Malassezia yeast colonises hair follicles and triggers inflammation, producing small, uniform, itchy papules and pustules commonly on the forehead, upper back, and chest. It's often mistaken for bacterial acne but doesn't respond to standard antibacterial acne treatments. The term "fungal acne" is widely used, though technically it's a folliculitis rather than true acne. For more information, see our fungal acne guide.

Pityriasis Versicolor (Tinea Versicolor)

Pityriasis versicolor causes patches of skin that are lighter or darker than the surrounding area. It's most common on the trunk and shoulders and is more likely to appear after time in the sun. Malassezia furfur is the primary species involved. It's not contagious and doesn't cause any harm beyond cosmetic changes to skin tone.

Atopic Eczema

Malassezia is not a cause of atopic eczema, but research suggests it can act as an allergen in some people with eczema, particularly on the head and neck. Some individuals with eczema develop a hypersensitivity response to Malassezia proteins, which may worsen flares in sebum-rich areas.

Does Everyone Have Malassezia on Their Skin?

Yes, in practical terms. Malassezia colonises human skin shortly after birth and remains present throughout life. Having Malassezia on your skin doesn't mean you have a skin condition.

The key question isn't whether you have Malassezia, but whether your skin and immune system are managing it in balance.

Why Does Malassezia Cause Problems for Some People and Not Others?

This is one of the most commonly asked questions, and the honest answer is that we don’t have a complete picture yet. Several factors appear to increase susceptibility:

Genetics. Some people's immune systems respond more strongly to Malassezia or its by-products. There's a clear hereditary component to conditions like seborrheic dermatitis.

Sebum production. Higher sebum output, in other words those with more oily skin, provides more "food" for Malassezia and may allow it to grow more densely. This is why seborrheic dermatitis often worsens during puberty and in people with naturally oily skin.

Immune status. Seborrheic dermatitis is significantly more common and more severe in people with conditions affecting the immune system, including HIV [5]. Immunosuppressant medications can also increase susceptibility.

Stress. Psychological stress is a well-documented trigger for seborrheic dermatitis flares [6] (as well as other skin conditions). The mechanism isn't fully understood but may involve the effect of stress on immune regulation and sebum production.

Season and climate. Cold, dry winters and high humidity can both trigger flare ups in different people, though individual responses vary.

Skincare products. Some cosmetic ingredients, particularly certain oils and emollients, can provide a healthy environment for Malassezia to thrive. This is especially relevant for people prone to Malassezia folliculitis.

How Is Malassezia Overgrowth Managed?

The most common approaches target Malassezia directly or reduce the conditions that allow it to overgrow.

Antifungal treatments. Ketoconazole and ciclopirox are clinically proven antifungal treatments used in medicinal shampoos and creams for seborrheic dermatitis and dandruff.

Zinc pyrithione. Used in over-the-counter dandruff shampoos. It has antifungal and antibacterial properties and is well supported by clinical evidence for dandruff and seborrheic dermatitis of the scalp. It’s worth noting that zinc pyrithione is no longer available in the UK or EU.

Piroctone olamine. An antifungal alternative to zinc pyrithione, increasingly used in some hair and skin care formulations. You can learn more about piroctone olamine here.

Adjusting your skincare routine. For people prone to Malassezia folliculitis, identifying and removing cosmetic ingredients that feed Malassezia can make a significant difference. Certain fatty acids (particularly lauric acid and myristic acid in some formulations) appear to be preferentially metabolised by Malassezia.

If you're unsure whether your skin symptoms are related to Malassezia, it's always worth consulting a GP or dermatologist. Several conditions look similar but require different approaches. Fungal acne and “regular” acne are a prime example.

Myth vs. Fact: Common Misconceptions About Malassezia

Myth: Malassezia means your skin is dirty or unhygienic.
Fact: Malassezia is present on almost all adult skin regardless of hygiene habits. Over-washing can actually disrupt the skin barrier and worsen conditions like seborrheic dermatitis.

Myth: Malassezia is contagious
Fact: Malassezia is already present on almost everyone's skin. It doesn't spread from person to person in any meaningful sense. You cannot "catch" seborrheic dermatitis or fungal acne from another person.

Myth: Malassezia is the same as bacterial acne.
Fact: Malassezia folliculitis and acne vulgaris look similar but have different causes. Antibiotics don't treat Malassezia, and antifungals don't treat bacterial acne.

Myth: Once you have a Malassezia-related condition, it never goes away.
Fact: Many people manage their symptoms well long-term. Some conditions, like pityriasis versicolor, often clear with appropriate treatment. Others, like seborrheic dermatitis, may be chronic but are usually manageable.

Myth: Malassezia only affects the scalp.
Fact: Malassezia lives across many sebum-rich areas of the body including the face, chest, back, and ears.

FAQ

What is Malassezia in simple terms?
Malassezia is a type of yeast (fungus) that lives naturally on almost everyone's skin. It feeds on the natural oils your skin produces and is usually harmless. In some people, it can contribute to conditions like dandruff, seborrheic dermatitis, or fungal acne.

Is Malassezia harmful?
Not in most cases. It's a normal part of the skin microbiome. It only tends to cause problems when it overgrows or when the skin's immune response to it is abnormally sensitive.

Can you get rid of Malassezia permanently?
No, and you wouldn't want to. Malassezia is part of a healthy skin microbiome and antifungal treatments reduce overgrowth; they don't eradicate Malassezia entirely.

Does diet affect Malassezia?
The research is limited but some evidence suggests that high-sugar diets or diets rich in certain fatty acids may influence sebum composition and Malassezia activity. This is an emerging area and far more research is needed before dietary recommendations can be made.

Can stress cause Malassezia flares?
Stress doesn't cause Malassezia itself, but it's a recognised trigger for conditions like seborrheic dermatitis. Managing stress as part of a broader skincare approach may help reduce flare frequency. Learn more about how stress can affect the skin here.

Summary

Malassezia is a lipid-dependent yeast found on the skin of almost all healthy adults. It is a normal part of the skin microbiome and in most people it causes no problems, but in those with certain genetic traits, immune responses, or skin types, it can contribute to dandruff, seborrheic dermatitis, Malassezia folliculitis, and pityriasis versicolor.

References

[1] Gaitanis, G., Magiatis, P., Hantschke, M., Bassukas, I.D., & Velegraki, A. (2012). The Malassezia genus in skin and systemic diseases. Clinical Microbiology Reviews, 25(1), 106–141.

[2] Cho, Y.J., Kim, T., Croll, D., Park, M., Kim, D., Keum, H.L., Sul, W.J., & Jung, W.H. (2022). Genome of Malassezia arunalokei and its distribution on facial skin. Microbiology Spectrum, 10(3), e00506-22.

[3] DeAngelis, Y.M., Gemmer, C.M., Kaczvinsky, J.R., Kenneally, D.C., Schwartz, J.R., & Dawson, T.L. Jr. (2005). Three etiologic facets of dandruff and seborrheic dermatitis: Malassezia fungi, sebaceous lipids, and individual sensitivity. Journal of Investigative Dermatology Symposium Proceedings, 10(3), 295–297.

[4] Ranganathan, S., & Mukhopadhyay, T. (2010). Dandruff: the most commercially exploited skin disease. Indian Journal of Dermatology, 55(2), 130–134.

[5] Jackson, J.M., Alexis, A., Zirwas, M., & Taylor, S. (2024). Unmet needs for patients with seborrheic dermatitis. Journal of the American Academy of Dermatology, 90(3), 597–604.

[6] Misery, L., Touboul, S., Vinçot, C., Dutray, S., et al. (2007). Stress and seborrheic dermatitis. Annales de Dermatologie et de Vénéréologie, 134(11), 833–837.