The usual cause of scalp flakes is dandruff, which can sometimes cause itching. However, persistent flakes accompanied by redness or irritation may indicate an underlying skin condition that requires specific treatment.
Seborrhoeic dermatitis, scalp psoriasis, contact dermatitis and fungal infections can cause symptoms similar to dandruff. Since these conditions have different causes, recognising their features can help determine when medical attention is needed.
Although the presence of flakes can offer useful clues, it is not always possible to identify the underlying condition by appearance alone.
Common causes of scalp scaling
1. Dandruff and seborrhoeic dermatitis
Dandruff usually appears as white or yellowish flakes on the scalp and may be accompanied by itching. It is often considered a milder form of seborrhoeic dermatitis.
Seborrhoeic dermatitis is an inflammatory skin condition that can cause greasy or yellowish scales, redness and irritation. It can also affect other areas, including the eyebrows, sides of the nose and behind the ears.
Compared with ordinary dandruff, seborrhoeic dermatitis tends to cause more noticeable inflammation and may recur even after the symptoms improve.
2. Scalp Psoriasis
Psoriasis is another condition that can cause persistent scalp scaling. Scalp psoriasis typically appears as thick, well-defined patches covered with white or silvery scales.
These patches may extend beyond the hairline and can sometimes occur on other parts of the body, particularly the elbows and knees. Nail changes, such as pitting or separation of the nail from its bed, may also occur.
Scalp psoriasis can cause itching, soreness and cracking. Unlike ordinary dandruff, it often requires specific treatment to control the inflammation and scaling. Depending on its severity, treatment may include medicated shampoos, prescribed creams or other therapies.
3. Contact Dermatitis
Contact dermatitis develops when the scalp reacts to certain ingredients in hair dyes, shampoos, conditioners, fragrances or styling products. Symptoms may include itching, redness, burning and scaling.
These symptoms can develop after using a new product or following repeated exposure to a product that was previously tolerated.
Contact dermatitis may result from irritation or an allergic reaction. Identifying and avoiding the product or ingredient responsible is an important part of treatment. If symptoms persist, a dermatologist may recommend further evaluation, including patch testing if an allergic reaction is suspected.
4. Fungal infections of the scalp
Scalp ringworm, also known as tinea capitis, is a fungal infection that can cause scaling and itching similar to dandruff. Other signs include broken hairs, patchy hair loss and inflamed areas. In some cases, the scalp may develop swollen, pus-filled lesions.
Tinea capitis is particularly common in children and requires appropriate treatment. Unlike ordinary dandruff, it generally needs prescription antifungal medication taken by mouth. In severe cases, particularly when treatment is delayed, the infection can cause permanent scarring and hair loss.
If a fungal infection is suspected, prompt medical assessment is advisable.
When should you suspect something other than dandruff?
The following signs may indicate that scalp scaling needs further attention:
- Persistent or recurring flakes
- Thick, well-defined patches
- Redness, burning or irritation after using a hair product
- Scaling that extends beyond the hairline
- Broken hairs or patchy hair loss
- Painful swelling or pus-filled lesions, which may indicate significant inflammation or infection and require prompt medical attention
These signs can offer useful clues, but different scalp conditions may have similar symptoms. A dermatologist can examine the scalp and determine the most likely cause.
Everyday scalp care: What can help?
A few simple steps may help reduce irritation and prevent the scalp from getting worse:
- Wash your hair regularly with a shampoo suited to your scalp and hair type, and rinse thoroughly.
- If dandruff is the likely cause, use an appropriate anti-dandruff shampoo according to its instructions.
- Avoid scratching the scalp or forcibly removing flakes, as this can damage the skin and worsen irritation.
- If a hair product causes burning, redness or itching, stop using it. Consult a doctor if the symptoms persist or worsen.
- Avoid introducing several new hair products at once, as this can make it difficult to identify the cause of a reaction.
- Keep combs and hairbrushes clean, and avoid sharing them, particularly if a fungal infection is suspected.
These measures may help manage some symptoms, but persistent flakes should not be treated indefinitely by trying different products.
Why is the correct diagnosis important?
Each of these conditions requires a different approach to treatment. Depending on the cause, treatment may involve medicated shampoos, topical anti-inflammatory medicines, antifungal medication or avoiding a product that irritates the scalp.
Some infections, including scalp ringworm, may require oral medication. In certain cases, tests such as fungal microscopy, culture or a skin biopsy may be needed to confirm the diagnosis.
A dermatologist can determine whether these tests are necessary based on the symptoms and examination. Identifying the cause is important because a treatment that works for one condition may not help another.
If the flakes keep returning or are accompanied by redness, pain or hair loss, it is worth having the scalp examined by a dermatologist. Treating the underlying condition, rather than repeatedly changing hair products, can help address the problem more effectively.
The author is a consultant dermatologist at Rela Hospital, Chennai.
The opinions expressed in this article are those of the author and do not purport to reflect the opinions or views of THE WEEK.
