Dandruff is a common condition that causes the skin on the scalp to flake. The symptoms of dandruff are itchy scalp and skin flakes on the scalp, hair, eyebrows, beard, and shoulders. In infants, it can be scaly and crusty scalp with cradle cap. Dandruff is usually caused by dry skin, irritated and oily skin, sensitivity to hair care products, and other conditions like psoriasis, eczema, etc.