Itchy Scalp: Possible Causes — Answers From a Dermatology Perspective
An itchy scalp is a common problem and can happen for many reasons. Sometimes it is a simple issue like dryness, but persistent itching may be a sign of a skin condition that needs attention.
1. Dandruff (Seborrheic Dermatitis)
One of the most common causes of an itchy scalp.
Possible signs:
- White or yellowish flakes
- Greasy or irritated scalp
- Redness
- Itching that comes and goes
It is often related to an overgrowth of a normal scalp yeast called Malassezia, combined with oil and inflammation.
2. Dry Scalp
A dry scalp may occur due to:
- Cold weather
- Dry indoor air
- Frequent washing
- Harsh shampoos
- Hot water showers
Signs:
- Small dry flakes
- Tight feeling on the scalp
- Mild irritation
3. Product Irritation or Allergy
Hair products can trigger irritation or allergic reactions.
Possible triggers:
- Hair dyes
- Fragrances
- Styling products
- Shampoos or conditioners
Symptoms may include:
- Itching
- Burning
- Redness
- Rash
4. Psoriasis of the Scalp
Scalp psoriasis is an inflammatory skin condition that can cause:
- Thick, silvery scales
- Raised patches
- Itching or soreness
- Flaking that may extend beyond the hairline
5. Head Lice
Head lice can cause intense itching, especially behind the ears and near the neck.
Possible signs:
- Persistent itching
- Small insects or eggs (nits) attached to hair strands
- Irritated skin from scratching
