Scalp Folliculitis (Malassezia)
Most itchy, monotonous little bumps in the hair are not acne. Scalp folliculitis is inflammation of the hair follicles, and on a scalp the most common driver is Malassezia — a yeast that lives on everyone's skin and thrives exactly where this one does: in a warm, covered, sebum-rich follicle field. That distinction is the whole point of this page, because the yeast form and the bacterial form respond to opposite treatments. Acne products and antibiotics can leave a Malassezia scalp unchanged or slowly worse, while an anti-fungal shampoo used properly often settles it within weeks. Getting the identification right first saves months.
How to recognize it
Malassezia folliculitis on the scalp is remarkably uniform: dozens of small, same-sized, dome-shaped bumps, many with a pinpoint pustule centred on a hair, spread in even sheets across the crown, hairline and nape. Itch dominates over soreness — people describe a prickling, crawling scalp, worse when hot or sweaty. There are no blackheads. If you find varied lesion sizes, blackheads, and a few deep tender nodules mixed together, ordinary acne fits better; if a single area is hot, swollen and genuinely painful, think bacterial folliculitis instead.
What causes it
Malassezia overgrowth in the follicle
Malassezia is lipophilic — it feeds on sebum — and the scalp offers more of it than almost anywhere. When the yeast multiplies inside follicles rather than sitting on the surface, the immune response produces the itchy uniform bumps that define this condition.
Heat, sweat and covered hair
Humidity, hot weather, hats worn all day and hair tied up while damp raise the temperature and moisture at the follicle. This is why the condition classically flares in summer, after training, and in people who cover their hair for long stretches.
Recent antibiotics
Antibiotics taken for acne or another infection reduce bacteria but do nothing to yeast, which can then expand into the space. A scalp eruption that appeared or worsened after a course of antibiotics is a strong clue that yeast is involved.
Oils and rich leave-in products
Malassezia metabolises certain fatty acids, so hair oils, oil-based masks and rich leave-in creams applied at the roots can act as fuel. Removing them from the scalp is genuinely part of treatment, not an optional extra.
Ingredients with evidence
| Ingredient | Role |
|---|---|
| Ketoconazole shampoo | The best-studied anti-Malassezia shampoo active. Widely available over the counter in many countries — ask a pharmacist which strength and schedule suits you rather than improvising. |
| Zinc pyrithione | An anti-fungal shampoo active with a long track record against Malassezia; lather, leave several minutes so it can act, then rinse. |
| Selenium sulfide | Another anti-dandruff active that lowers yeast levels on the scalp; some formulations can discolour treated or light hair, so read the label. |
| Salicylic acid (BHA) | Does not kill yeast but clears the scale and plug over follicle openings, which helps an anti-fungal reach where it needs to be. |
| Centella asiatica | A soothing option for the irritated skin left behind after a flare; supportive only, with no anti-fungal effect of its own. |
| Niacinamide | Moderates sebum output, which is the substrate the yeast feeds on, and calms surrounding redness — a sensible maintenance layer once the flare has settled. |
Building the routine
Treat the yeast, and take the oil off the roots. Use an anti-fungal shampoo — ketoconazole, zinc pyrithione or selenium sulfide — as your main wash several times a week; lather it directly into the scalp, leave it in place for three to five minutes so the active has real contact time, then rinse thoroughly. Thirty seconds of contact is the usual mistake. Stop applying oils, oil-based masks and rich leave-in creams to the scalp for the duration. Dry your hair rather than tying it up wet, shower promptly after training, and let the scalp breathe instead of living under a cap. When the itch settles, keep one maintenance wash a week: Malassezia is a permanent resident, so this is control rather than eradication. Ask a pharmacist or your doctor which product and schedule fits your scalp and hair colour.
When to see a doctor
Frequently asked questions
How do I know if my scalp folliculitis is fungal?
The pattern gives it away: dozens of same-sized bumps, itching rather than pain, no blackheads, flares with heat and sweat, and often a history of antibiotics or hair oils. Varied lesions with blackheads point to acne, and a single hot painful spot points to bacteria.
Can I use dandruff shampoo for scalp folliculitis?
That is the standard first approach when yeast is suspected, since anti-dandruff shampoos contain the same anti-fungal actives. The key is leaving the lather on for several minutes rather than rinsing immediately. Ask a pharmacist which one suits your hair.
Why does my scalp folliculitis keep coming back?
Because Malassezia is a normal skin resident, not an invader you can eliminate. Warmth, sweat and sebum let it climb back to problem levels. A once-weekly maintenance wash, showering after sweating and keeping oils off the roots reduce how often it returns.
Should I put oil on scalp folliculitis?
No. Malassezia feeds on certain fatty acids, so hair and scalp oils can make a yeast-driven eruption worse. Coconut oil, rich masks and oil-based leave-ins belong on the lengths at most, and off the scalp entirely while a flare is active.
Sources & further reading
What this page cites about the condition itself:
There is no single study of this exact question. The guidance here is reasoned from the ingredient profiles below, each of which carries its own references:
- Salicylic Acid2 refs
- Centella Asiatica2 refs
- Niacinamide2 refs
Show every reference behind this page (5)
- Salicylic acid as a peeling agent: a comprehensive review (PubMed)cited by Salicylic Acid
- FDA OTC monograph — acne drug products (salicylic acid 0.5–2%)cited by Salicylic Acid
- Bylka W et al. Centella asiatica in dermatology: an overview. Phytother Res 2014 Aug (PubMed)cited by Centella Asiatica
- European Commission CosIng database — Centella Asiatica Extractcited by Centella Asiatica, Niacinamide
- Niacinamide: mechanisms of action and its topical use in dermatology (PubMed)cited by Niacinamide
Medical disclaimer
Ingredients mentioned on this page
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