Dry Scalp: Causes and How to Treat It

What dry scalp looks and feels like

• small, fine, white or gray flakes that fall easily, often onto dark clothing
• itchiness and a tight feeling, especially after washing
• skin that looks dull rather than red or greasy
• often dry skin elsewhere: legs, arms, hands

It is a condition of too little moisture in the outer skin layer, which cracks and sheds.

Dry scalp vs dandruff

The two are easily mixed up, but treatments differ, so it is worth telling them apart.

Severe dandruff is a form of seborrheic dermatitis.

Causes of dry scalp

Environment and habits

• Cold, dry weather and indoor heating: low humidity pulls moisture from skin.
• Hot showers: strip natural oils.
• Washing too often: especially with strong, foaming shampoos (sulfates).
• Harsh hair products: alcohol-based sprays, gels and dry shampoo build-up.
• Sun exposure: can dry and burn the scalp, particularly with thinning hair.
• Swimming: chlorine dries the scalp.

Skin conditions

• Atopic dermatitis (eczema): dry, itchy, sometimes red and thickened skin; often history of eczema, asthma or hay fever.
• Contact dermatitis: an allergic or irritant reaction to hair dye (especially PPD), fragrances, preservatives or nickel in hair accessories. It causes itching, redness and sometimes swelling along the hairline.
• Psoriasis: well-defined, thick, red plaques covered in silvery scale, often spreading past the hairline and behind the ears.

Other factors

Older skin produces less oil. Underactive thyroid, dehydration and some medicines, such as retinoids, can dry the skin. Scalp ringworm in children causes scaly patches with hair breakage and needs oral antifungal medicine.

How dry scalp is diagnosed

Most people can manage dry scalp at home. A doctor or dermatologist diagnoses it by looking at the scalp, the flakes and the skin elsewhere. They may scrape flakes for fungal testing if ringworm is suspected, or patch test you if a product allergy is likely. A biopsy is rarely needed.

How to treat dry scalp

Washing

• Use lukewarm, not hot, water.
• Choose a mild, fragrance-free, sulfate-free shampoo.
• Wash less often, for example every 2 to 3 days, if your hair allows.
• Always follow with a conditioner, and rinse product residue thoroughly.

Moisturizing

• Apply a few drops of a light oil or a scalp serum (with glycerin, squalane or ceramides) to damp scalp after washing.
• A pre-wash oil treatment once a week: massage oil into the scalp, leave for 30 minutes, then wash out. Coconut, jojoba or mineral oil are common choices. If you may have dandruff, avoid heavy plant oils, which can feed Malassezia yeast.
• Use a humidifier in the bedroom in winter.

Products to avoid

• Fragranced and alcohol-heavy styling products
• Very frequent dry shampoo
• Hair dyes if they cause itching or rashes

If it might be dandruff

If gentle care does not help, try an anti-dandruff shampoo with ketoconazole, zinc pyrithione, selenium sulfide or salicylic acid two to three times a week for 4 weeks. Leave it on for 3 to 5 minutes before rinsing. Improvement suggests the cause was dandruff or seborrheic dermatitis rather than simple dryness.

When a doctor is needed

Prescription treatments include steroid scalp solutions for eczema and psoriasis, medicated shampoos, and oral antifungals for ringworm. Contact allergy is managed by avoiding the trigger product.

Frequently asked questions

How do I know if I have dry scalp or dandruff?

Dry scalp causes small, fine, white flakes, with dry skin elsewhere and little redness. Dandruff causes larger, oily, yellowish flakes with a greasy scalp and sometimes red patches. Dry scalp improves with moisturizing and less washing; dandruff improves with antifungal medicated shampoo.

What causes a dry, itchy scalp?

The most common causes are cold, dry air, hot water, washing too often and harsh shampoos or hair products. Eczema, contact allergy to hair dye or products, psoriasis and aging skin also cause dryness and itching. Head lice and ringworm cause itch with other signs.

What is the best home remedy for dry scalp?

Wash with lukewarm water and a gentle, fragrance-free shampoo, wash less often, condition every time, and apply a light oil or scalp serum. A humidifier helps in winter. Avoid scratching, which damages skin and worsens itching.

Can dry scalp cause hair loss?

Simple dry scalp does not cause hair loss, though heavy scratching can break hairs. Hair loss with scaling can mean scalp ringworm, psoriasis, severe seborrheic dermatitis or another scalp condition, and should be checked by a doctor.

How long does dry scalp take to go away?

With gentler washing and moisturizing, most dry scalp improves within 2 to 4 weeks. It may return each winter. If it has not improved after 4 weeks, or there is redness, thick scale or hair loss, see a doctor or dermatologist.