Scalp psoriasis

Key takeaways

• Scalp psoriasis is an autoimmune skin disease, not a shampoo problem. Scalp involvement affects up to 80% of people with plaque psoriasis and is often resistant to topical treatment (Kaur 2025).
• Look for sharply bordered, thick, silvery-white plaques that extend past the hairline. Dandruff and seborrheic dermatitis flakes are finer, yellowish and less sharply bordered. The two can overlap, and a clinician should tell them apart.
• First-line treatments are topical: corticosteroids, keratolytics such as salicylic acid, tar and vitamin D analogues. Betamethasone plus calcipotriene is described as the most effective topical combination (Ghafoor 2022). A European consensus offers a grading and treatment algorithm (Ortonne 2009).
• Biologics work well for severe scalp disease. A 2025 network meta-analysis of 35 randomized trials found every intervention beat placebo, with secukinumab 300 mg and bimekizumab 320 mg ranked highest (Kaur 2025). A 2025 trial tested guselkumab in scalp psoriasis across all skin tones (McMichael 2025).
• Hair loss can occur but is usually temporary and follows plaque inflammation and scratching. See a dermatologist to rule out other causes.
• Hair care: gentle scale removal with salicylic acid or coal tar under medical advice, no picking, and soft brushing. A keratolytic hydrating shampoo improved mild to moderate psoriasis in a double-blind vehicle-controlled study (Massiot 2023).

The science

Psoriasis involves an immune loop (T cells and the IL-17 and IL-23 pathways) that speeds up skin-cell turnover. The scalp is hard to treat because hair blocks application and nearby face skin limits irritating options (Ortonne 2009). The efficacy rankings come from the network meta-analysis above, which stressed the lack of head-to-head trials and standardised outcomes.

What it means by hair profile

• Thick, curly or coily hair: lotions are harder to apply, so foams, solutions and shampoo formats and parting the hair in sections help. The guselkumab trial was designed to include varied skin tones and hair textures (McMichael 2025).
• Colour-treated or chemically relaxed hair: avoid adding harsh treatments to inflamed skin.
• Fine hair: greasy ointments weigh hair down, so overnight application and washing out is common practice.

Myths and facts

• Myth: dandruff shampoo cures psoriasis. Fact: antifungal shampoos help seborrheic overlap, not psoriasis plaques.
• Myth: it is contagious. Fact: it is not.

Bottom line

See a clinician for a diagnosis if scale is thick or reaches the forehead and ears. Soften scale with a keratolytic, then use a prescribed topical. Moderate to severe disease needs a dermatologist and possibly systemic or biologic therapy. Keep medicated shampoos on the scalp skin and condition the lengths. Discuss with a doctor.