Psoriasis: Concise Overview of Facts and Statistics

Psoriasis is an immune-mediated condition often marked by thick red patches with silvery scales on the elbows, knees, and scalp. There’s no cure for psoriasis, but treatment can help ease the symptoms.

Design by Ruth Basagoitia
Psoriasis causes itchiness and irritation and may be painful.

While scientists don’t know what causes psoriasis, they do know that the immune system and geneticsTrusted Source play significant roles in its development.

Read on to get the scoop on psoriasis causes, prevalence, symptoms, treatment options, and more.

What are the symptoms of psoriasis?

Psoriasis usually causes thick, red skin patches with silvery scales that itch or feel sore.

It appears on the eyelids, ears, mouth and lips, skin folds, hands and feet, scalp, and nails.

In severe cases, it can progress to cover large areas of your body and cause various uncomfortable symptoms.

In people with light skin, it tends to appear red or pink with a silvery-white scale. In people with dark skin, it may appear salmon-colored or violet with a silvery-white or grayscale. It may also be harder to spot.

You may have occasional flare-ups followed by times when you don’t have symptoms.

What percent of people have psoriasis?

About 2-3% of the world’s population has some form of psoriasis, according to the World Psoriasis Day consortium. That’s over 125 million people.

Anyone can get psoriasis, regardless of age. However, according to the National Psoriasis Foundation, it is most likely to appear first between the ages of 15 and 25. The condition affects about 3.2% of women and 2.8% of men in the United States, according to a combination of a 2021 study and 2020 U.S. census data. That’s just over 7.4 million people ages 20 years or older.

Prevalence by type

The types of psoriasis with their prevalence are:

Psoriasis type Prevalence
plaque psoriasis 80–90% of cases
scalp psoriasis 45–56% of people with psoriasis
nail psoriasis : 50% of people with psoriasis
guttate psoriasis : 8% of people with psoriasis
inverse psoriasis 21–30% of people with psoriasis
pustular psoriasis 3% of people with psoriasis
erythrodermic psoriasis 2% of people with psoriasis
Note that 30–33% of people with psoriasis can also develop psoriatic arthritis, which is a type of arthritis.

What causes psoriasis?

The exact cause of psoriasis isn’t known, though research suggests that psoriasis could be an autoimmune disease and that some autoantigens might be connected to its development.

In your immune system, it’s the job of your T cells to attack foreign organisms to keep you healthy. For those with psoriasis, the T cells mistakenly attack healthy skin cells. This leads to an overproduction of new skin cells, T cells, and white blood cells.

This leads to dead skin cells accumulating. The accumulation creates the hallmark scaly patches seen in psoriasis.

No type of psoriasis is contagious. You cannot catch psoriasis from someone who has it.

Who is most at risk for psoriasis?

Many people with psoriasis have a family history of the disease, and researchers have found some genes linked to it.

You’re more likely to develop psoriasis if one of your parents has it. The heritability of the condition is estimated at 60–90%Trusted Source.

Other risk factors include:

• smoking
• skin trauma
• obesity

Flare-ups may also be brought on by emotional stress or triggered by certain drugs, weather, or alcohol.

How is psoriasis diagnosed?

Despite its considerable effect on the quality of life, psoriasis is underdiagnosed and undertreated. If you suspect you may have psoriasis, contact a board-certified dermatologist who can examine your skin, nails, and scalp for signs of the condition.

In most cases, a medical professional can typically conduct a physical exam and review your medical history to make a diagnosis.

If there’s any doubt, your medical professional may do a biopsy to confirm the diagnosis. Psoriatic arthritis will need additional testing.

How is psoriasis treated?

There’s currently no cure for psoriasis, but treatment can slow down the growth of skin cells and relieve pain, itching, and discomfort.

Treatments can be divided into three main types, though medical professionals may combine more than one type:

• topical treatments such as corticosteroids
• light therapy
• systemic medications

The best treatment varies by individual, considering the type of psoriasis, its location on the body, and the possible side effects of medications.

For mild cases, various over-the-counter (OTC) topical ointments can help. You can also do a number of things at home to help treat the symptoms of psoriasis.

Can psoriasis cause complications?.

Having psoriasis increases your chance of developing psoriatic arthritis. Psoriasis may also increase your chance of developing:

• high blood pressure
• cardiovascular disease
• type 2 diabetes
• kidney disease
• Parkinson’s disease
• other autoimmune
• disorders, such as Crohn’s disease and celiac
• disease
• eye problems such as conjunctivitis, uveitis, and blepharitis

Living with psoriasis

While medication can reduce or clear psoriasis, anything that irritates your skin can cause psoriasis to flare — even when you use medication. Because the condition is chronic, psoriasis can significantly affect your quality of life.

In addition, having psoriasis can negatively affect your mental health. Frequent bouts of psoriasis can cause people to withdraw from social situations or work. This may lead to feelings of depression.

A 2022 research review indicates people living with psoriasis are 1.5 times more likely to experience depression and anxiety than people without psoriasis.

Having peer support can be helpful when living with a chronic condition like psoriasis. Bezzy Psoriasis is a judgment-free communal space where you can get advice, read stories, and connect with others with psoriasis.

Talk with your doctor.

If you have psoriasis, see your medical professional as often as recommended. They can help you create a treatment plan that works for you.

Because of the risk of complications, your medical professional will likely do regular exams and screenings to check for related conditions.

Jen Thomas is a journalist and media strategist based in San Francisco. When she’s not dreaming of new places to visit and photograph, she can be found around the Bay Area struggling to wrangle her blind Jack Russell Terrier or looking lost because she insists on walking everywhere. Jen is also a competitive Ultimate Frisbee player, a decent rock climber, a lapsed runner, and an aspiring aerial performer.