dandruff causes and treatment
You may need to switch between types of shampoos if one type controls the dandruff at first but later loses its effectiveness. How often you should use dandruff shampoo varies from daily to a couple of times a week. Check the directions on the bottle. When shampooing your hair, rub the shampoo into your scalp well. Leave the shampoo on your head for 5 minutes, or as directed, before you rinse.
3) Dry skin. People with dry skin tend to get dandruff more often. Winter cold air, combined with overheated rooms is a common cause of itchy, flaking skin. People with dandruff caused by dry skin tend to have small flakes of dandruff; the flakes are not oily. 4) Seborrheic dermatitis (irritated, oily skin)