Condition
Seborrheic dermatitis
Seborrheic dermatitis is dandruff with redness and inflammation, and it is controlled rather than cured with antifungal shampoos and, for flares, short-term anti-inflammatory treatment.
Key takeaways
- Seborrheic dermatitis (SD) is dandruff with inflammation. It causes greasy or dry yellowish scale, redness and itch on the scalp, and often on the eyebrows, sides of the nose, ears and chest. It is chronic and relapsing.
- It is common. The pooled global prevalence is 4.38% (95% CI 3.58-5.17%), higher in adults (5.64%) than children (3.70%) and newborns (0.23%), with the highest estimate in South Africa (8.82%) and the lowest in India (2.62%). That meta-analysis covered 121 studies and 1.26 million people, with very high variation between studies (Polaskey 2024).
- The causes are multiple: Malassezia yeast, sebaceous activity and immune response, plus triggers such as immune suppression, neurological disease, hormonal and drug factors (Dall'Oglio 2022). Staphylococcus and Streptococcus also appear in the scalp picture (Leroy 2023).
- Standard care is a topical antifungal plus, for flares, an anti-inflammatory. A 2024 expert consensus (7 experts, 131 papers) says no approved therapies exist specifically for moderate-severe scalp SD and offers an algorithm built on antifungal shampoos with topical corticosteroids for flares (Vano-Galvan 2024).
- Ketoconazole 2% shampoo cut 6-month relapse from 47% (placebo) to 19% (weekly use) (Peter 1995). A 0.6% selenium sulfide shampoo matched ketoconazole 2% over 6 weeks (Farris 2026). See ketoconazole, selenium sulfide, ciclopirox and zinc pyrithione.
- Lifestyle evidence is weak. A systematic review found associations with a Western diet, alcohol and lower zinc and vitamin D, while obesity links were mixed (Woolhiser 2024).
- It can look like psoriasis, scalp ringworm, atopic dermatitis or allergic contact dermatitis; see scalp psoriasis, tinea capitis and itchy scalp.
The science
Trichoscopy (magnified scalp examination) findings reported for scalp SD include branching vessels, yellowish scales and, in newer descriptions, a "dandelion" vascular pattern and oily material inside follicles, which help separate it from psoriasis (Leroy 2023). The microbiome is disrupted: bacterial and fungal networks collapse in dandruff and SD (Park 2017). A shampoo trial combining antifungal actives showed clinical benefit alongside microbiome change (Maitre 2025, industry).
Head-to-head results for shampoos:
- Ketoconazole 2% was superior to zinc pyrithione 1% in severe disease (Pierard-Franchimont 2002).
- A ciclopirox plus salicylic acid shampoo was comparable to ketoconazole with better itch control (Squire 2002).
- A non-steroid combination shampoo was compared with 1% ketoconazole in 20 patients over 8 weeks (Dall'Oglio 2016).
- A clobetasol propionate 0.05% shampoo was tested in a pilot study (Reygagne 2007).
What it means by hair profile
- Coily and tightly curled hair: washing less often is common, which can allow scale to build up. Weekly washing with medicated shampoo applied to the scalp only is suggested for afro-textured hair (Fajuyigbe 2024). SD can mimic or coexist with scarring conditions in people of African descent, so persistent patches with hair loss need review.
- Oily scalp: SD often accompanies high sebum output.
- Men responded more strongly to zinc pyrithione in pooled data (Collins 2018).
Myths and facts
- Myth: SD is contagious or comes from poor hygiene. Fact: it is an inflammatory reaction to a yeast most people carry.
- Myth: it causes baldness. Fact: we found no evidence that SD itself causes permanent hair loss; rule out coexisting pattern hair loss or telogen effluvium.
- Myth: you can cure it. Fact: it is controlled, not cured, and relapse is the rule.
Bottom line
For mild disease, use an over-the-counter antifungal shampoo two to three times a week for 4 weeks, then weekly. Apply it to the scalp, leave it on for the label time, rinse, then condition the lengths. Rotate active ingredients if the response fades, and avoid heavy oils and pomades on affected skin until it is controlled. If the scalp is moderately or severely inflamed, a clinician can prescribe short-term treatment with a topical steroid or a prescription antifungal. Discuss with a doctor.
Studies 15
Polaskey MT et al. The Global Prevalence of Seborrheic Dermatitis: A Systematic Review and Meta-Analysis. JAMA Dermatol. 2024
Result: Pooled global prevalence of seborrheic dermatitis 4.38% (95% CI 3.58-5.17%); adults 5.64%, children 3.70%, newborns 0.23%; highest in South Africa (8.82%), lowest in India (2.62%); very high heterogeneity.
Read the study ↗Dall'Oglio F et al. An Overview of the Diagnosis and Management of Seborrheic Dermatitis. Clin Cosmet Investig Dermatol. 2022
Result: Seborrheic dermatitis is multifactorial: Malassezia yeast, sebaceous activity and immune response, with triggers such as immune suppression, neurological disease, hormonal and drug factors.
Read the study ↗Leroy AK et al. Scalp Seborrheic Dermatitis: What We Know So Far. Skin Appendage Disord. 2023
Result: Trichoscopy findings in scalp seborrheic dermatitis include branching vessels, yellowish scales, a dandelion vascular pattern and oily material in follicles; Staphylococcus and Streptococcus feature in the scalp picture.
Read the study ↗Vano-Galvan S et al. A comprehensive literature review and an international expert consensus on the management of scalp seborrheic dermatitis in adults. Eur J Dermatol. 2024
Result: Antifungal shampoos with topical corticosteroids for flares are the mainstay; no approved therapies exist specifically for moderate-severe scalp seborrheic dermatitis.
Read the study ↗Peter RU, Richarz-Barthauer U. Successful treatment and prophylaxis of scalp seborrhoeic dermatitis and dandruff with 2% ketoconazole shampoo: results of a multicentre, double-blind, placebo-controlled trial. Br J Dermatol. 1995
Tested: 2% ketoconazole shampoo twice weekly, then weekly or alternate-week prevention, versus placebo
Result: 88% had an excellent response; relapse within 6 months was 19% with weekly ketoconazole versus 47% with placebo.
Read the study ↗Farris PK et al. Beyond Efficacy: 0.6% Selenium Disulfide Shampoo Matches 2% Ketoconazole for Seborrheic Dermatitis with Superior Cosmesis. J Drugs Dermatol. 2026
Tested: 0.6% selenium disulfide versus 2% ketoconazole shampoo
Result: Scale score fell 77.9% with selenium disulfide versus 69.5% with ketoconazole, with no significant difference between them; selenium disulfide was preferred for cosmetic feel across curl types.
Read the study ↗Show 9 more studies
Piérard-Franchimont C et al. A multicenter randomized trial of ketoconazole 2% and zinc pyrithione 1% shampoos in severe dandruff and seborrheic dermatitis. Skin Pharmacol Appl Skin Physiol. 2002
Tested: ketoconazole 2% versus zinc pyrithione 1% shampoo (open randomised)
Result: Ketoconazole was significantly superior in severe cases, with fewer recurrences; both were well tolerated.
Read the study ↗Squire RA, Goode K. A randomised, single-blind, single-centre clinical trial to evaluate comparative clinical efficacy of shampoos containing ciclopirox olamine (1.5%) and salicylic acid (3%), or ketoconazole (2%, Nizoral) for the treatment of dandruff/seborrhoeic dermatitis. J Dermatolog Treat. 2002
Tested: ciclopirox 1.5% plus salicylic acid 3% shampoo versus ketoconazole 2% shampoo
Result: Both improved dandruff and seborrheic dermatitis; only the ciclopirox combination significantly reduced itch.
Read the study ↗Dall'Oglio F et al. Noncorticosteroid Combination Shampoo versus 1% Ketoconazole Shampoo for the Management of Mild-to-Moderate Seborrheic Dermatitis of the Scalp: Results from a Randomized, Investigator-Single-Blind Trial Using Clinical and Trichoscopic Evaluation. Skin Appendage Disord. 2016
Tested: non-steroid combination shampoo versus 1% ketoconazole shampoo
Result: Compared a non-steroid combination shampoo with 1% ketoconazole using clinical and trichoscopic evaluation.
Read the study ↗Reygagne P et al. Clobetasol propionate shampoo 0.05% in the treatment of seborrheic dermatitis of the scalp: results of a pilot study. Cutis. 2007
Result: Pilot study of a clobetasol propionate 0.05% shampoo for scalp seborrheic dermatitis.
Read the study ↗Park T et al. Collapse of human scalp microbiome network in dandruff and seborrhoeic dermatitis. Exp Dermatol. 2017
Result: The scalp bacterial and fungal co-occurrence network collapsed in dandruff and seborrheic dermatitis.
Read the study ↗Maître M et al. Scalp Microbiome Dynamics Can Contribute to the Clinical Effect of a Novel Antiseborrheic Dermatitis Shampoo Containing Patented Antifungal Actives: A Randomized Controlled Study. 2025
Result: A shampoo combining antifungal actives showed clinical benefit alongside changes in the scalp microbiome. Industry study.
Read the study ↗Woolhiser E et al. Nutrition, Obesity, and Seborrheic Dermatitis: Systematic Review. JMIR Dermatol. 2024
Result: Seborrheic dermatitis was associated with a Western diet and alcohol and with lower zinc and vitamin D; obesity links were mixed; an 8-week prebiotic trial lowered scalp sebum. Mostly weak case-control data.
Read the study ↗Collins LZ et al. Sex-related differences in response to zinc pyrithione shampoo vs. non-anti-dandruff shampoo. Int J Cosmet Sci. 2018
Tested: 1% zinc pyrithione versus a non-anti-dandruff shampoo
Result: Zinc pyrithione beat the control shampoo at all weeks; the 4-week flake-score gap was larger in men (-17.5) than women (-11.1). Unilever authors.
Read the study ↗Fajuyigbe D, et al. Weekly hair washing: the recommended solution for women with afro-textured hair to alleviate dandruff and scalp discomfort. J Dermatol. 2024
Result: In South African women with afro-textured hair, dandruff and itch returned to their peak about a week after washing.
Read the study ↗Related
- DandruffDandruff is a common, chronic flaking of the scalp driven by yeast, skin oil and your skin's sensitivity, and an antifungal shampoo controls it well as long as you keep using it.
- Scalp psoriasisScalp psoriasis is an autoimmune skin condition that needs medical treatment, not just a stronger shampoo, and good options exist from topical steroids to biologics.
- Tinea capitis (scalp ringworm)A fungal infection of scalp skin and hair shafts that mostly affects children but also adults; it needs oral antifungal medicine, and shampoo alone will not cure it.
- Itchy scalpAn itchy scalp has many causes, and the most common is dandruff or seborrheic dermatitis, so check for flakes first and think about allergy or nerve causes if the skin looks normal.
- KetoconazoleAn antifungal shampoo ingredient that is among the best-proven treatments for dandruff and, with much weaker evidence, a possible add-on for pattern hair loss.
- Selenium sulfideAn old, inexpensive anti-dandruff active that new trials suggest works about as well as ketoconazole and has been tested across all curl types.
- CiclopiroxAn antifungal shampoo ingredient with randomized-trial support for scalp seborrheic dermatitis and a particular edge on itch, with no good evidence that it grows hair.
- Zinc pyrithioneThe most widely used anti-dandruff shampoo ingredient, proven in large trials to cut flaking, though most of those trials were run by the companies that sell it.