Persistent scalp flaking is frustrating, especially when you have tried several shampoos. Ordinary dandruff usually improves within a few weeks of the right treatment. When flakes continue, or come with other symptoms, a different condition may be responsible. Knowing when to seek help saves months of guesswork.
First, check the basics
Before you decide that treatment has failed, make sure it had a fair chance.
- Have you used an anti-dandruff shampoo regularly for about a month?
- Do you leave it on the scalp for the time stated on the label before rinsing?
- Have you tried a second shampoo with a different active ingredient?
- Are you washing often enough?
Dandruff Shampoo Ingredients: What to Look For explains the ingredients and how to use them.
Signs that you should see a doctor
See a doctor or dermatologist if:
- Flaking has not improved after about four weeks of correct treatment.
- The scalp is very itchy, red, swollen or painful.
- You have thick, crusted or silvery scales.
- Patches extend beyond the hairline to the forehead, ears or neck.
- You notice hair loss, broken hairs or bald patches.
- There is oozing, pus or a bad smell.
- A child has scaly patches on the scalp.
- You have a weakened immune system.
Conditions that cause lasting flaking
| Condition | Typical features |
|---|---|
| Seborrhoeic dermatitis | Red, greasy skin with yellowish scale on the scalp, eyebrows, sides of the nose, ears or chest |
| Scalp psoriasis | Thick, well-defined red patches with silvery-white scale; may also affect elbows, knees or nails |
| Contact dermatitis | Itchy, red, flaky skin after contact with a product such as hair dye |
| Scalp ringworm (tinea capitis) | Scaly patches with broken hairs or bald areas; mainly in children; needs prescription tablets |
| Eczema | Dry, itchy, inflamed skin, often with eczema elsewhere |
| Less common conditions | Some inflammatory scalp diseases cause scale with permanent hair loss |
Several of these look alike, and psoriasis and seborrhoeic dermatitis can overlap. A trained eye, and sometimes a test, is needed to tell them apart.
How to prepare for the appointment
- Do not wash your hair on the day if you can avoid it, so that the scale is visible.
- List the products you have used, including shampoos, dyes and treatments, and how long you used each.
- Note your symptoms: when they began, what makes them better or worse, and whether they affect other parts of the body.
- Mention medicines, illnesses and family history of skin conditions.
- Take photos if the flaking comes and goes.
How to Track Hair Loss Before a Dermatologist Visit has a template for recording hair and scalp changes.
What the dermatologist may do
- Examine the scalp, hair and nails, often with a magnifying device.
- Take a small scraping of scale or a few hairs to test for fungus.
- Rarely, take a small skin sample (biopsy) if the diagnosis is unclear.
- Arrange patch testing if an allergy is suspected.
Treatments that may be offered
Depending on the cause, treatment may include prescription-strength antifungal shampoos, corticosteroid scalp lotions or foams for short periods, products that soften thick scale, other anti-inflammatory scalp treatments, or antifungal tablets for ringworm. Many scalp conditions are long-term, so the plan usually has two parts: clearing a flare, and keeping it away with regular maintenance.
While you wait for the appointment
- Keep washing with a gentle or anti-dandruff shampoo.
- Do not pick or scrape scale, which can cause bleeding and, in psoriasis, worsen plaques.
- Avoid new products, dyes and tight styles.
- Loosen scale by massaging in a little mineral or olive oil for an hour before washing, if this does not irritate.
If itching is the main symptom, see Itchy Scalp: Common Causes and Care Options. If you are also losing hair, read Hair Thinning: Causes and When to Get Help. To review the difference between dandruff and dryness, go back to Dandruff vs Dry Scalp: How to Tell the Difference.
Related on ArniSun
- Dandruff vs Dry Scalp: How to Tell the Difference
- Dandruff Shampoo Ingredients: What to Look For
- Itchy Scalp: Common Causes and Care Options
- How to Track Hair Loss Before a Dermatologist Visit
- Hair Thinning: Causes and When to Get Help
Sources and further reading
Frequently asked questions
How long should I try dandruff shampoo before seeing a doctor?
About a month of regular, correct use is a reasonable trial. Go sooner if your scalp is painful, very inflamed or you are losing hair.
Is scalp psoriasis contagious?
No. Psoriasis is an immune-related condition and cannot be caught from another person.
Can scalp flaking cause permanent hair loss?
Ordinary dandruff does not. Hair shed during a flare of psoriasis or seborrhoeic dermatitis usually regrows. A few less common conditions can scar the scalp, which is another reason to have lasting symptoms checked.