Hi.. seborrheic dermatitis is a very severe form of dandruff. You don't have permanent solution to this condition. But there are good medicated shampoos available to bring it under control
Use coal tar with salicylic acid preparation containing shampoo. Use at least twice or thrice in a week depending on the severity of the condition
Even you have some oral medication to bring it under control
For more details. Consult a dermatologist
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