It can be due to dandruff, seborrheic dermatitis
or tinea capitis which is a fungal infection
of the scalp. Seborrheic dermatitis is a common
that causes flaky, dry, white to yellowish scales to form on
oily areas on
scalp or anywhere on
face. You can treat flaking and dryness with over-the-counter dandruff or medicated shampoos. Shampoo the hair vigorously and frequently (preferably daily).