What it is
Dandruff is a common scalp condition characterised by flaking of the skin, often with associated itching.
Flaking of the scalp skin, often with itching, caused by a combination of yeast overgrowth, sebum production, and individual skin sensitivity.

At a glance
What it is
Dandruff is a common scalp condition characterised by flaking of the skin, often with associated itching.
Commonly experienced as
Evidence context
Research-supportedSafety
See staying safeHistory & Origin
Dandruff (pityriasis capitis) is a chronic, relapsing scalp condition producing visible white or yellowish flakes of shed skin, often accompanied by itching. It is the mild end of a spectrum that includes seborrhoeic dermatitis (more inflammatory, extending beyond the scalp). The primary causative organism is Malassezia globosa, a naturally occurring lipophilic yeast that colonises sebaceous areas of the skin. Individual susceptibility is determined by sebum production rates, immune response to Malassezia metabolites, and skin barrier function. Dandruff is exacerbated by stress, hormonal changes, cold weather, infrequent shampooing, and certain hair products. It is not contagious and does not reflect poor hygiene.
The Evidence
What the research says about dandruff — its causes, effective management options, and when to seek professional assessment.
Well-understood condition with effective antifungal options
Dandruff is one of the most studied scalp conditions, with strong evidence supporting antifungal shampoos as first-line management. Most people respond well to over-the-counter options, though maintenance use is typically needed to prevent relapse.
Ketoconazole 2%, zinc pyrithione, selenium sulphide, and ciclopirox are all well-evidenced and supported by NICE guidelines as first-line options. They work by reducing Malassezia yeast on the scalp. Regular use controls symptoms; ongoing maintenance use helps prevent recurrence. Coal tar has evidence but is less commonly recommended due to cosmetic and environmental concerns.
Flaking accompanied by noticeable hair loss should be assessed — possible causes include scalp psoriasis, seborrhoeic dermatitis, or tinea capitis. Thick, adherent scale with redness extending beyond the scalp may indicate psoriasis or severe seborrhoeic dermatitis. People who are immunocompromised and experiencing persistent or worsening dandruff should seek professional input promptly.
Topical corticosteroids are sometimes used alongside antifungals for scalp inflammation in seborrhoeic dermatitis, but high-potency steroids used long-term on the scalp risk skin thinning and should only be used under dermatological guidance. Over-the-counter antifungal shampoos are generally safe for routine use; follow product instructions and avoid contact with eyes.
The primary driver is Malassezia globosa, a naturally occurring yeast that colonises sebaceous skin. Individual susceptibility depends on sebum production, immune response, and skin barrier function. Stress, hormonal changes, cold weather, and certain hair products can worsen symptoms. Dandruff is not contagious and does not reflect poor hygiene.
Ayurvedic practice uses medicated oils such as neem and bhringraj for scalp care. TCM may frame dandruff as wind-heat or damp-heat affecting the scalp. Tea tree oil has some antimicrobial evidence and is widely used in natural health shampoos. Apple cider vinegar rinses are popular but lack robust clinical evidence. These approaches may complement, but do not replace, evidence-based management.
Starting with a zinc pyrithione or ketoconazole shampoo is a reasonable first step for most people. If symptoms persist after several weeks, or if the scalp becomes inflamed or spreads beyond the hairline, a pharmacist or dermatologist can guide next steps. Complementary approaches may support scalp health alongside evidence-based options, but inflated outcome claims for any single remedy should be viewed with caution.
Safety first
General, informational guidance — not diagnostic. A qualified practitioner can advise on your own situation.
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