I'm not sure if there are any natural alternatives, however there are several nonprescription products.
Shampoos with salicylic acid, tar, zinc, selenium sulfide, and/or ketoconazole can help.
Scalpicin, regular or maximum strength, can help also. The maximum strength contains 1% hydrocortisone, a steroid/cortisone much weaker than clobex lotion.
P & s liquid can help remove thick scales.
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