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Superficial scales are removed with salicylic acid [T/Sal] or tar [T/Gel, Reme-T, Pentrax] shampoos. Just like salicylic acid can help the psoriasis on your skin, it can be effective on the scalp, too. And it won't damage your hair, either. Diffuse scalp scales can be removed with fluocinolone (Derma-Smoothe/FS) lotion at bedtime and washed out in the morning. This regimen should be repeated for 5 to 10 days. It removes the scales and controls inflammation. Try applying other ointments at bedtime, too. Phenol, sodium chloride and liquid paraffin (Baker P and S) can be applied at bedtime and washed out in the morning. Hot olive-oil turbans also help remove very thick scaling. They are just what they sound like – your scalp doused in olive oil, wrapped in one or two wet, hot towels. Leave them wrapped around your head for 30 minutes to fight psoriasis. You can repeat this treatment as often as you'd like or as often as your doctor recommends. Steroid solutions and gels penetrate through the hair and into the scales. Common brand names are Cormax, Luxiq, Lidex, Temovate, Topicort. They are available at certain pharmacies, online, or through your doctor.

Summary:
Use salicylic acid or tar shampoo to remove superficial plaques. Try applying fluocinolone at night and washing it out in the morning. Consider trying an olive oil turban if you have plaque on your scalp. Try applying steroid gels to your scalp.