Itchy Scalp: Possible Causes (According to Dermatologists)
An itchy scalp is common and can happen for many reasons. The cause may be as simple as dryness or irritation, but sometimes it can signal a skin condition that needs treatment.
1. Dandruff / Seborrheic dermatitis
One of the most common causes of scalp itching.
Signs may include:
- White or yellowish flakes
- Oily or greasy scalp
- Redness or irritation
- Itching that comes and goes
It is often linked to an overgrowth of a normal scalp yeast called Malassezia, along with oil and inflammation.
2. Dry scalp
A dry scalp can occur due to:
- Cold weather
- Dry indoor air
- Frequent washing
- Harsh shampoos
Typical signs:
- Small dry flakes
- Tight or uncomfortable feeling
- Mild itching
3. Product irritation or allergy (contact dermatitis)
Hair products can trigger itching, including:
- Hair dyes
- Shampoos and conditioners
- Styling products
- Fragrances or preservatives
Signs may include:
- Burning or stinging
- Redness
- Rash
- Itching after using a new product
4. Psoriasis of the scalp
Scalp psoriasis is an immune-related skin condition that can cause:
- Thick, silvery scales
- Well-defined red patches
- Itching or soreness
- Flaking that may extend beyond the hairline
5. Head lice
Lice can cause intense itching, especially:
- Behind the ears
- At the back of the neck
Look for:
- Tiny insects
- Eggs (nits) attached firmly to hair strands
