When hair (especially oily hair) is not washed frequently enough, skin cells build up on the scalp and cause itch and dandruff. Prevention is by washing hair at least once a week.
2. Dry Scalp Skin
Dry scalp skin lacking the protective oil layer, is vulnerable to infections, and easily gets irritated. From the top of the head or hairline skin cells in the form of white dust (dry dandruff) may shed. Common causes of dry flaky scalp are:
Frequent hair washing with hot water and aggressive shampoos
Holding hair dryer close to the head
3. Stress
Stress is a common cause of itch. Scalp, face, and neck are often affected.
4. Neurogenic Excoriation
Scratching from psychical reasons may cause itchy scalp scratches (neurogenic excoriations).
5. Dandruff, Caused by Fungi or Seborrheic Dermatitis
Dandruff are whitish, greasy, thin skin flakes, few millimeters in size, appearing in the hair and falling on shoulders. The scalp skin is itchy and may be reddened. The common cause is fungus Malassezia furfur (formerly known as Pityrosporum ovale) that normally lives on the scalp, but may overgrow on the greasy scalp, irritating it and causing scaling.
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