some good treatments

Zinc pyrithione shampoos, such as American Crew Anti Dandruff Shampoo and Head & Shoulders, contain an antibacterial and antifungal agent (zinc pyrithione) which has been shown to fight the fungus that causes dandruff. Selenium sulfide shampoos, such as Selsun Blue, can prevent cell turnover and may help control the malassezia fungus. These types of shampoos may discolor blond or gray hair and can cause significant discoloration in chemically treated hair, so follow the directions carefully and rinse well.Ketoconazole shampoo, like Nizoral, contains a broad antifungal agent.