Yes, coal tar is used to treat scalp psoriasis.
Coal tar slows skin cell growth and reduces inflammation, scaling, and itching associated with psoriasis.[1] It's available in shampoos, creams, gels, and oils at concentrations from 0.5% to 5%, applied directly to the scalp 1-2 times weekly, left on for 5-10 minutes, then rinsed.[2][3]
How effective is coal tar for scalp psoriasis?
Studies show it clears mild to moderate scalp psoriasis in 50-70% of patients after 4-8 weeks, often combined with salicylic acid to loosen scales or corticosteroids for better results.[4] It's less effective for severe cases, where systemic treatments may be needed.
What are common ways to apply it?
- Shampoos (e.g., Neutrogena T/Gel, MG217): Wet hair, massage in, leave 5 minutes, rinse; use 2-3 times weekly.
- Gels or creams: Part hair, apply to plaques, cover with shower cap overnight if tolerated, wash out next day.
- Start with low strength to test tolerance; rotate with other therapies to avoid reduced effectiveness.[2][5]
What side effects should you watch for?
It can cause temporary redness, stinging, dryness, or increased sun sensitivity on the scalp. Strong odors may bother some users. Rare allergic reactions include rash or swelling. Avoid eyes and open wounds; not recommended during pregnancy.[1][3]
Can you combine it with other psoriasis treatments?
Yes, often paired with topical steroids (e.g., clobetasol) for faster clearing or UV light therapy. A common regimen: coal tar shampoo followed by steroid lotion.[4] Check with a doctor to avoid interactions.
Why might it not work for everyone?
Tanning or irritation limits long-term use for some. Newer biologics like dupilumab outperform it for stubborn cases but are pricier and injected.[6]
[1]: American Academy of Dermatology (AAD) - Psoriasis treatment: Coal tar
[2]: National Psoriasis Foundation - Coal tar for psoriasis
[3]: Mayo Clinic - Coal tar topical (psoriasis)
[4]: British Journal of Dermatology - Coal tar in scalp psoriasis (review, 2018)
[5]: NHS UK - Scalp psoriasis treatments
[6]: Journal of the American Academy of Dermatology - Biologics vs topicals (2022)