You will benefit from medicated ketoconazole containing shampoos. There are many brands available and can be availed by a prescription from a dermatologist/doctor near you. It should be used to wash your scalp daily. Leave the shampoo on for 2 to 5 mins after applying it and then wash off. Another disease that closely resembles dandruff is Psoriasis involving the scalp. Psoriasis will not respond to treatment with ketoconazole. A dermatologist will be able to make a definite diagnosis and treat you accordingly. Warm regards. Dr. Rajdeep Mysore. Chirag Hospital Bangalore.