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For dry dandruff
,you can use any good 2% ketoconazole
shampoo in combination with ZPTO. There are good salicylic acid
preparation in shampoo base are also avialable which can help for the same.
If this doesn't help the you can apply any topical steroidal lotion once at night time.
Hope this answers your query,if you have any further question ,kindly write back to us.