Scalp Psoriasis vs. Dandruff: How to Tell the Difference (With Pictures)

Scalp psoriasis and dandruff can both cause itching and flaking, and telling them apart isn’t always easy. The right treatment depends on knowing which condition you have.

So, if you’re noticing white flakes in your hair or on your shoulders, how can you tell the difference? Here’s how scalp psoriasis and dandruff compare, what they look like, and how each one is treated.

What is scalp psoriasis?

Psoriasis is a common condition that causes an itchy skin rash on different parts of your body. It happens when an overactive immune system makes skin cells grow too fast. Scientists don’t know the exact cause of psoriasis. But it’s likely a combination of genetics and different things you’re exposed to in your life, like an infection. 

About half of people with psoriasis will have it on their scalp, which can lead to itching and flaking. Some people may also have psoriasis on other parts of their body. But psoriasis affects more than just your skin. Many people who have psoriasis will also develop psoriatic arthritis (joint inflammation) or other conditions, like diabetes. 

No matter where you have it, psoriasis is a chronic condition that doesn’t go away on its own.

What is dandruff?

Dandruff is a common condition that causes small pieces of dry skin to flake off your scalp. Most people notice flakes in their hair or on their shoulders. Flakes may be more obvious on dark hair or dark clothes. Dandruff can also make your scalp itchy. 

It’s not clear exactly what causes dandruff. One theory is that it’s the result of the immune system’s overreaction to a normal skin yeast called Malassezia. Unlike psoriasis, dandruff isn’t considered an autoimmune condition and only affects your skin. Dandruff is also a chronic condition. 

Differences between dandruff and psoriasis

Scalp psoriasis and dandruff may seem similar, but they have some important differences. Here’s what to look for with these two common conditions.

What do scalp psoriasis and dandruff look like?

Scalp psoriasis looks like raised patches, usually with dry, white or silvery scales overlying the rash. You may notice psoriasis extending into your skin at the hairline, neck, and around your ears. You may also notice patches of hair loss. Hair loss is usually temporary and happens because of skin inflammation or scratching.

Thick, gray psoriasis patches in the scalp causing some hair loss.

Thick psoriasis patches extending from the scalp on the neck.

With dandruff, skin flakes tend to look more yellow and greasy. People with dandruff often have oily or greasy-looking hair. And they may also have dandruff in their eyebrows and beard (if they have one). Unlike psoriasis, dandruff doesn’t affect hairless skin.

Thick, yellow flakes in the scalp from dandruff.

Small, white flakes from dandruff.

Diagnosing scalp psoriasis and dandruff

To the trained eye, telling the difference between psoriasis and dandruff is usually pretty straightforward. A healthcare professional can often make a diagnosis based on your symptoms and how the rash looks. 

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• Is it eczema or psoriasis? See side‑by‑side photos and learn how these conditions differ in symptoms, triggers, and treatments, so you can have a more informed conversation with your clinician.

• Treating scalp psoriasis: From medicated shampoos to prescription foams and solutions, explore topical treatments that can help ease itching, flaking, and irritation when psoriasis affects your scalp.

• Tips to calm dandruff and itching: Try gentle shampoos, scalp oils, and other at‑home strategies to soothe a dry, flaky scalp — whether your flakes are from dandruff, psoriasis, or another cause.

Your dermatologist or healthcare professional may also check the rest of your skin for signs of psoriasis in other areas. In some cases, they may take a small skin biopsy from your scalp to send to the lab to confirm the diagnosis. 

Best treatments for scalp psoriasis

Most scalp psoriasis can be treated with topical medications. These are treatments you apply directly to your scalp, like shampoos, foams, or liquids. 

For mild cases, medicated over-the-counter (OTC) shampoos with salicylic acid (like DHS Sal Shampoo) or coal tar (like Neutrogena T/Sal) may be enough to control symptoms. 

Prescription topical treatments for scalp psoriasis 

For more stubborn psoriasis, prescription-strength topical treatments may be needed. Some good options include: 

• Steroid shampoos, foams, or solutions (liquids), like clobetasol shampoo (Clobex) or fluocinonide solution (Vanos)

• Vitamin D analogs, like calcipotriene solution (Dovonex)

• Combination products that include both a steroid and a vitamin D analog, like Taclonex (betamethasone / calcipotriene suspension)

Other treatments for scalp psoriasis 

Another option to treat scalp psoriasis is localized light therapy, also called the excimer laser. This painless treatment uses ultraviolet B (UVB) light on your scalp. It’s usually done 2 to 3 times a week at your doctor’s office. 

If these treatments don’t work, stronger treatments with pills or injectable medications may be needed. This isn’t common, but it’s an option for people with severe psoriasis or those who also have psoriatic arthritis. 

Best treatments for dandruff

Most dandruff can be controlled with OTC dandruff shampoos. Start by using the shampoo every 1 to 2 days. Once your symptoms improve, you can use it less often to maintain the effect. 

Look for shampoos with these active ingredients: 

• Pyrithione zinc

• Selenium sulfide

• Ketoconazole 1%

• Coal tar

• Salicylic acid 

Prescription treatments for dandruff

If OTC treatments don’t work, your dermatologist may recommend prescription-strength shampoos or creams to help control the flaking. Possible ones include:

• Steroid shampoos, foams, or solution (liquids), like fluocinolone shampoo (Capex) or clobetasol foam (Olux)

• Antifungal shampoos, like ketoconazole (Nizoral)

• Selenium sulfide shampoos, like Selseb 

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Written by:

Maria Robinson, MD, MBA

Maria Robinson, MD, MBA, is a board-certified dermatologist and dermatopathologist who has practiced dermatology and dermatopathology for over 10 years across private practice, academic, and telehealth settings. She is a fellow of the American Academy of Dermatology and the American Society of Dermatopathology.

Edited by:

Sophie Vergnaud, MD

Sophie Vergnaud, MD, is the Senior Medical Director for GoodRx Health. A pulmonologist and hospitalist, she practiced and taught clinical medicine at hospitals in London for a decade before entering a career in health education and technology.

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