1. Seborrheic dermatitis (or seborrhea): This common skin condition causes redness, itching, and flaking. It can occur on many parts of the body. When it affects the scalp, it’s called dandruff. It’s treatable. Most often, over-the-counter medicated shampoos will stop the flakes from falling. More stubborn cases will likely benefit from prescription-strength shampoos and steroid creams.
2. Scalp psoriasis can cause dandruff-like itching and flaking. Psoriasis happens when the immune system triggers too many skin cells to grow on various parts of the body. That can include your scalp. People with psoriasis may be more likely to get dandruff, but psoriasis is not dandruff.
3. Eczema. This skin condition can make your scalp itchy and flaky. It’s most common in babies and children, but anyone can get it. The cause is unknown. Moisturizers and prescription steroid creams can help relieve the symptoms, as can avoiding harsh soaps and scratching. It also helps to avoid stress whenever possible.
4. Ringworm of the scalp (Tinea Capitis): This is a fungal infection that causes small patches of itchy, scaly skin.
5. Head lice infestation: Head lice live and feed off the blood on the scalp causing itchiness.
The best thing to do would be to visit a dermatologist or a medical practitioner to ascertain the exact cause of your itchy scalp.