Seborrheic Dermatitis vs Psoriasis: Understanding The Difference

Seborrheic dermatitis vs psoriasis: they look quite similar and can lead to red, scaly skin on the scalp. This is why even some clinicians at first glance confuse them. But the reality is that both have different causes and treatments, so the right diagnosis changes what happens next.

In this guide, Dr. Eddie walks you through some of the key differences between psoriasis and seborrheic dermatitis so you can tell them apart.

What Is Seborrheic Dermatitis (Cradle Cap)?

Seborrheic dermatitis, often referred to as cradle cap in babies, is an inflammatory skin condition that causes greasy, flaky scales on areas with active sebaceous glands. It can appear anywhere on the body; however, it commonly affects the

• Scalp
• Eyebrows
• Side of the nose
• Forehead
• Skin folds
• Groin/diaper area

Symptoms of Seborrheic Dermatitis

You can also think of it as a more severe form of dandruff. Some common seborrheic dermatitis symptoms that you may notice are:

• White or yellow flakes
• Greasy, oily scales
• Redness on the skin
• Irritation
• Inflamed skin
• Itchy skin
• Scaly skin
• Thick, crusty scales (cradle cap)

According to the National Eczema Association, the global prevalence of SD is around 3 to 5%, while 70% of babies around the age of 3 months experience cradle cap. 

Seborrheic Dermatitis Causes

Although the exact cause of seborrheic dermatitis is still unknown. But the scientists and researchers believe it is caused by a combination of factors, like

• Overactive sebaceous glands
• Malassezia yeast
• Overproduction of sebum

When the sebaceous glands start producing excess sebum, it provides a breeding ground for the Malassezia yeast that is naturally present on the skin. When Malassezia yeast and sebum combine, they create a byproduct, oleic acid, that causes inflammation, scaling, and flaking on the skin.

What Is Psoriasis?

Psoriasis is a chronic autoimmune skin condition that causes the skin cells to grow at a much faster rate because the new cells reach the surface of the skin before the old ones shed, and they accumulate on the skin into thick, scaly patches.

Psoriasis patches can appear anywhere on the body. However, mostly seen on the 

• Scalp
• Elbows
• Knees
• Lower back
• Trunk 

Psoriasis has five common types; each may manifest differently, but scaly patches are common.

• Plaque psoriasis (Most common): Thick, raised plaques with silver-white scales.
• Guttate psoriasis: Small droplet-like spots.
• Inverse psoriasis: Smooth, shiny patches that appear on skinfolds.
• Pustular psoriasis: white pustules surrounded by red skin.
• Erythrodermic psoriasis: Causes redness and is life-threatening. 

Symptoms of Psoriasis

Some common symptoms that you may notice on your skin are 

• Dry skin
• Itching
• Raised skin patches
• Silvery-white skin scales
• Skin cracking
• Bleeding
• Burning sensation

According to the National Psoriasis Foundation, it affects around 2.8% males and 3.2% females in the USA. 

Psoriasis Causes

Psoriasis is believed to be caused by an autoimmune disorder. Our immune system protects our body and skin from outside bacteria and allergens by releasing a certain type of cell known as T-cells. 

When the immune system mistakenly attacks its own healthy skin, this triggers inflammation in the skin that speeds up the skin cell production. The accumulation of these cells results in thick, scaly patches.

Difference Between Seborrheic Dermatitis VS Psoriasis

Treating Seborrheic Dermatitis VS Psoriasis

The underlying causes for psoriasis and seborrheic dermatitis are different, which is why their treatment approaches vary. Here is how you can manage each condition. 

Seborrheic Dermatitis Treatment

Even though there is no permanent cure for seborrheic dermatitis, proper scalp care can help reduce the itching, flaking, and inflammation. 

1. Use a medicated seborrheic dermatitis shampoo to wash your scalp and affected areas daily. 
2. While washing, let the shampoo rest on your skin for a few minutes before rinsing it off.
3. You can also use a cradle cap brush while shampooing to gently remove the loose flakes and scales. 
4. Once the symptoms improve, use the shampoo 2 to 3 times a week for better results and to prevent future flare-ups. 
5. Avoid scratching the skin or picking at flakes it can lead to skin infections. 

Try Happy Cappy Medicated Shampoo For Cradle Cap, Seborrheic Dermatitis, and Dandruff. It contains pyrithione zinc, which helps in reducing the growth of Malassezia yeast and reducing flaking and scaling associated with seborrheic dermatitis (a.k.a. cradle cap) without irritating the skin. It is free from harsh chemicals like parabens, sulfates, fragrances, and dyes. 

Psoriasis Treatment

Psoriasis needs a proper treatment plan prescribed by a dermatologist. The treatment may include

• Topical therapies: Corticosteroid creams or vitamin D analogs to reduce inflammation and slow skin cell production.
• Systemic treatments: In moderate to severe cases, oral or injectable medications may be prescribed.
• Phototherapy (light therapy): Controlled exposure to UV light can help manage flare-ups.
• Moisturizers: Use a hypoallergenic moisturizing cream daily to soothe scaling, itching, and cracking.
• Lifestyle changes: Identifying and avoiding triggers such as stress, infections, or harsh soaps can reduce flares.

Can you have Seborrheic Dermatitis and Psoriasis at the Same Time?

Yes, you can have both seborrheic dermatitis and psoriasis at the same time. This condition is often referred to as sebopsoriasis. In sebopsoriasis, symptoms from both conditions overlap, which can make diagnosis and treatment more challenging.

Here are a few features of these conditions:

• You may see greasy, yellowish flakes along with thick, silvery plaques. 
• It usually affects the scalp, hairline, eyebrows, and ears.
• Its treatment usually requires a combined approach, including the use of medicated shampoo and topical or systemic treatments. 

Conclusion

In conclusion, seborrheic dermatitis and psoriasis may cause redness and scaly patches, but these are two different skin conditions. Their causes and symptoms are different, and so are their treatments. 

• Seborrheic dermatitis appears as greasy yellow or white flakes and scales. While psoriasis appears as silvery-white scales. 
• Seborrheic dermatitis can be easily managed at home with the use of a seborrheic dermatitis shampoo. However, psoriasis needs a different level of treatment and attention. 

To manage seborrheic dermatitis and cradle cap, try our Happy Cappy Bath Bundle. It includes a cradle cap shampoo and a cradle cap brush to help you get rid of those scales fast.

FAQs

• About
• Latest Posts

Follow Me

Dr. Eddie Valenzuela

Dr. Eddie Valenzuela is an award winning pediatrician and the founder and CEO of Pediatric Solutions, LLC. More about Dr. Eddie.

Follow Me

Latest posts by Dr. Eddie Valenzuela (see all)

• WhatToExpect Mentioned Happy Cappy Shampoo as the Best Medicated Shampoo For Cradle Cap - September 29, 2025
• Parents.com Mentioned Happy Cappy Shampoo in the List of 10 Best Shampoos for Babies and Kids of All Hair Types - September 29, 2025
• Chain Drug Review Covers Happy Cappy’s CVS Launch Nationwide - August 27, 2025