Psoriasis vs Seborrheic Dermatitis on the Scalp and Face

Psoriasis and seborrheic dermatitis can look alike on the scalp and face, but they usually differ in the scale. Psoriasis tends to form thick, dry, silvery-white plaques with sharp edges, while seborrheic dermatitis gives thinner, greasy, yellowish flakes in oily areas like the eyebrows, sides of the nose and behind the ears. When features of both appear together, dermatologists sometimes call it "sebopsoriasis".

If you have already read our guide on scalp psoriasis vs dandruff, think of this post as the next step. Dandruff is the mildest end of seborrheic dermatitis, and here we look at the full condition, including how it shows up on the face.

What each condition actually is

Psoriasis

Psoriasis is a long-term, immune-driven skin condition. Skin cells build up too quickly and pile into raised, scaly plaques. The scalp is one of the most common places it appears: the US National Psoriasis Foundation reports that 52 to 80 percent of people with psoriasis have had scalp involvement at some point [1]. It is not contagious and it is not caused by poor hygiene.

Seborrheic dermatitis

Seborrheic dermatitis is a common inflammatory rash of the oily, "seborrheic" areas of the skin. A 2025 review estimated that it affects about 4.4 percent of people worldwide, more often adults than children [2]. A yeast that normally lives on everyone's skin, Malassezia, plays a central role: it breaks down skin oils into fatty acids that can irritate the skin in people who are prone to it [2]. Despite the name, people with seborrheic dermatitis do not always have extra-oily skin; the body's reaction to the yeast matters more [3].

Seborrheic dermatitis is very common in India too. In a 2025 study of 100 patients at a tertiary hospital in South India, scaling and itching were the most troublesome symptoms, and itching and embarrassment had the biggest effect on daily life [4].

Side-by-side: how to tell them apart

Feature	Psoriasis	Seborrheic dermatitis
Scale	Thick, dry, powdery, silvery-white	Thin, greasy or waxy, yellowish (can be dry and fine too)
Edges	Sharp, clearly marked borders	Softer, less defined edges
Thickness	Raised plaques you can feel	Usually flat or only slightly raised
Scalp pattern	Patches, often crossing the hairline onto forehead, neck or behind the ears	More diffuse flaking across the scalp
Face	Hairline, eyebrows, ears; less common in the middle of the face	Eyebrows, sides of the nose, between the brows, beard area, eyelid margins
Other body areas	Elbows, knees, lower back, nails, folds	Upper chest, armpits, groin folds; never palms and soles
Nails	Pitting, ridges or lifting are common	Nails are not affected
Itch	Can be itchy, burning or sore	Usually itchy, sometimes mildly

The National Psoriasis Foundation puts it simply: scalp psoriasis tends to look "powdery with a silvery sheen", while seborrheic dermatitis looks "yellowish and greasy" [1]. A 2025 review adds that psoriasis has drier, thicker scales, sharper borders and more frequent nail changes [2].

On Indian and other brown skin

Redness is harder to see on brown skin, so colour is a weaker clue for most Indian readers. The American Academy of Dermatology notes that on darker skin, seborrheic dermatitis can look pink, slightly purple, darker or lighter than the surrounding skin, and some people notice lighter patches or white spots on the scalp [5]. Psoriasis plaques on brown skin often look purple, brown or greyish rather than bright red [1]. Lighter or darker marks can remain for weeks after either condition settles.

When it is both: sebopsoriasis

Some people have features of both conditions at once. DermNet, a dermatologist-run reference, describes "sebopsoriasis" as an overlap with yellowish, greasy scale in the usual seborrheic areas, but with deeper colour, sharper margins and thicker scale than ordinary seborrheic dermatitis [6]. It typically appears on the scalp, eyebrows, the folds beside the nose, behind the ears and on the chest. Over time it may settle into looking more like one condition or the other [6].

This matters because a person can try anti-dandruff shampoo for months, see partial improvement, and assume it is "just dandruff" when psoriasis is also part of the picture. If flaking keeps returning, or you find similar patches elsewhere on your body, it is worth a proper check.

How a dermatologist tells them apart

Most of the time a skin specialist can tell the difference by looking carefully at the scalp, face, nails, elbows, knees and lower back, and by asking about family history. When it is unclear, they may use:

• Dermoscopy (trichoscopy): a handheld magnifier with light. Studies have found that scalp psoriasis tends to show regularly spaced red dots and globules, while seborrheic dermatitis shows more twisted or comma-shaped vessels on a yellowish background with fine greasy scale [7].
• Skin biopsy: a tiny sample examined under a microscope, used only when the picture is still unclear [2].

Many government medical college hospitals in India have dermatology outpatient departments where this check is available at low cost. Our guide on psoriasis on the face covers facial patches in more detail.

How care differs for each

Seborrheic dermatitis

• Antifungal shampoos and creams are the first-line treatment, because they reduce the Malassezia yeast. Ketoconazole and ciclopirox are the most commonly used [2]. In India, ketoconazole 2% shampoo is sold at chemists; for example, one common 110 ml brand was listed at an MRP of ₹225 on a major pharmacy site this week [8]. The product page itself advises using it under medical supervision rather than as a daily shampoo.
• Contact time matters. The AAD advises leaving medicated shampoo on the scalp for as long as your dermatologist recommends so it has time to work [9].
• For the face, dermatologists may prescribe ketoconazole cream, a mild steroid for short periods, or non-steroid creams such as tacrolimus or pimecrolimus [9].

Scalp and facial psoriasis

• Softening and lifting scale gently: salicylic acid or coal tar shampoos are commonly used over the counter [1]. Our guide to the best shampoo for scalp psoriasis explains what to look for on the label.
• Prescription treatment: topical steroids, vitamin D creams (calcipotriol), phototherapy and, for more extensive disease, tablets or biologics all have a real place under a dermatologist's care [1][6]. Do not stop a prescribed treatment without talking to your doctor.
• No picking: scratching and pulling off scale can injure the skin and make psoriasis worse. Use a soft brush and a gentle routine [1].
• Daily comfort care: gentle, fragrance-light products may help soothe dryness and itching between treatments. Swasti Botanicals' scalp psoriasis range is steroid-free, plant-based care meant to support, not replace, your doctor's plan.

A word on oils and herbal products

Oiling the scalp is a familiar habit in Indian homes, and for thick psoriasis scale, oil can help soften flakes before washing. Seborrheic dermatitis is different: because Malassezia feeds on skin oils [2], heavy oiling may not suit greasy, yellowish flaking. If you are unsure which condition you have, ask your doctor before oiling every night. With any herbal oil, patch-test on a small area first, avoid the eyes, and check with a doctor before using it on babies, young children, or if you are pregnant or breastfeeding. Some Ayurvedic herbs used for skin, such as babchi, can make skin more sensitive to sunlight.

Hair loss can worry people with either condition; see our post on whether scalp psoriasis can cause hair loss.

Everyday tips for Indian climate and routines

• Sweat and humidity: in humid cities, wash sweaty hair sooner after workouts or long commutes, especially if you wear a helmet.
• Winter dryness: in North Indian winters, dry air can make psoriasis plaques feel tighter and itchier. A gentle moisturiser around the hairline and ears can help.
• Stress and sleep: both conditions tend to flare during stressful periods such as exams or busy festival seasons.
• Hair products: hair dyes, strong-smelling hair oils and gels can irritate an inflamed scalp. Patch test first.

When to see a doctor

See a dermatologist (or your family doctor first) if any of these apply:

• Flaking or patches keep coming back or have not improved after a few weeks of an over-the-counter anti-dandruff shampoo.
• Thick, raised plaques, or patches spreading past the hairline onto the forehead, neck or ears.
• Similar patches on elbows, knees, lower back or nails, or nail pitting.
• Swollen, painful or stiff joints along with skin patches (possible psoriatic arthritis).
• Oozing, crusting, pus, fever, or rapidly spreading redness over large areas of the body.
• Sudden, severe seborrheic dermatitis in an adult who never had it before. Doctors take this seriously because it can be linked to other health conditions, including HIV and Parkinson's disease [2][3].
• Rash on a baby that is spreading, weeping, or affecting feeding or sleep.

Frequently asked questions

Can seborrheic dermatitis turn into psoriasis?

They are separate conditions, but they can overlap as "sebopsoriasis", and over time the picture may become clearer as one or the other [6]. A dermatologist can follow how it changes.

Does ketoconazole shampoo work for scalp psoriasis?

Ketoconazole targets the yeast linked to seborrheic dermatitis [2]. It is not a standard psoriasis treatment, though a doctor may suggest it when both conditions overlap. If an antifungal shampoo is not helping, ask your doctor whether psoriasis is involved.

Is seborrheic dermatitis contagious?

No. Neither seborrheic dermatitis nor psoriasis spreads from person to person through touch, combs or towels.

Why are my eyebrows and sides of the nose flaky?

These oily areas are classic places for seborrheic dermatitis [5][6]. Psoriasis can also affect the eyebrows, so if the patches are thick with sharp edges, or you have patches elsewhere, see a dermatologist.

Can I use a steroid cream from the chemist on my face?

Please do not use strong steroid creams or mixed "triple" creams on the face without a prescription. Facial skin is thin, and a doctor will pick the right strength and duration for you.

Sources

1. National Psoriasis Foundation. Scalp psoriasis.
2. Navarro Triviño FJ, Velasco Amador JP, Rivera Ruiz I. Seborrheic Dermatitis Revisited: Pathophysiology, Diagnosis, and Emerging Therapies. Biomedicines, 2025.
3. Valia RG. Etiopathogenesis of seborrheic dermatitis. Indian Journal of Dermatology, Venereology and Leprology, 2006.
4. Palanisamy et al. A clinicodemographic study and life quality assessment in seborrheic dermatitis at a tertiary care centre in South India. IP Indian Journal of Clinical and Experimental Dermatology, 2025.
5. American Academy of Dermatology. Seborrheic dermatitis: Signs and symptoms.
6. DermNet. Sebopsoriasis.
7. Cosmoderma. Role of dermoscopy in differentiating seborrheic dermatitis of scalp and scalp psoriasis.
8. PharmEasy. Ketomac 2% Shampoo 110 ml (price checked 5 October 2026).
9. American Academy of Dermatology. Seborrheic dermatitis: Diagnosis and treatment.

This article is for general information and is not medical advice. Please consult a qualified dermatologist or Ayurvedic doctor for diagnosis and treatment.