Quick answer
An itchy scalp in winter is usually one of three things, and the fix differs for each. Scratching makes all three worse.
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Shop verified shampoos →Three common causes
1. A dry scalp barrier
Cold air plus hot showers. Feels tight, flakes are fine and white.
2. Dandruff (seborrheic)
Yeast-driven. Flakes are larger, oilier, often yellowish.
3. Product buildup
Heavy oils or unrinsed conditioner sitting on the scalp.
What helps
Lukewarm water, not hot. A gentle shampoo used often enough to clear buildup, but not so often it strips. An anti-dandruff active only if the flakes are the oily kind. And stop scratching — it breaks skin and restarts the cycle.
When to see a doctor
Bleeding, thick crusts, spreading patches, or hair loss in patches.