Psoriasis plaques

Overview

Psoriasis is a long-term (chronic) skin condition that causes red, raised, scaly patches called plaques. These plaques are often itchy and can appear anywhere on the body, but most commonly on the elbows, knees, scalp, and lower back.

Yes, psoriasis is quite common. About 2-3% of people worldwide have some form of psoriasis, with plaque psoriasis being the most common type.

Psoriasis can affect anyone at any age, but it often first appears between the ages of 15 and 35. It affects men and women equally. It can also start in childhood or later in life.

Symptoms

Common symptoms

• Red, raised patches of skin (plaques) covered with silvery-white scales
• Itching, burning, or soreness on the affected skin
• Dry, cracked skin that may bleed
• Thickened, pitted, or ridged fingernails or toenails
• Stiff, swollen joints (possibly a related condition called psoriatic arthritis)

Symptoms in children

• Smaller, softer plaques that are less scaly than in adults
• Commonly affects the scalp, face, and diaper area
• May be mistaken for diaper rash or eczema
• Can cause emotional distress and affect self-esteem

Symptoms in older adults

• Plaques may be less red but still thick and scaly
• Can be harder to treat because skin is thinner and more fragile
• Higher risk of side effects from some treatments
• May be linked to other health conditions like diabetes or heart disease

Causes

Main causes

• Psoriasis is caused by an overactive immune system that speeds up skin cell growth. Normally, skin cells grow and shed over about a month. In psoriasis, they do so in just a few days, building up into plaques.
• Genetics play a large role—psoriasis tends to run in families.
• Triggers can include stress, infections (like strep throat), skin injury (cuts, scrapes, sunburn), certain medications, and cold or dry weather.

Risk factors

• Having a close family member with psoriasis
• Having a history of infections, especially strep throat in children
• Being overweight or obese
• Smoking or heavy alcohol use
• Chronic stress

When to see a doctor

See a doctor urgently if:

• If you have joint pain, swelling, or stiffness that limits movement (possible psoriatic arthritis)
• If your skin becomes very red, painful, or peels over large areas
• If you develop fever or chills along with new skin symptoms

Book a routine appointment if:

• If you have plaques that bother you, itch, or affect your quality of life
• If over-the-counter creams or shampoos are not helping
• If you are unsure whether your skin rash is psoriasis

Diagnosis

A doctor usually diagnoses psoriasis by looking at your skin, scalp, and nails. They will ask about your symptoms, family history, and any triggers. No special tests are needed in most cases.

Tests that may be done

• A skin biopsy (taking a small piece of skin to examine under a microscope) if the diagnosis is uncertain
• Blood tests to rule out other conditions if psoriatic arthritis is suspected

What to expect at your appointment

The doctor will examine your skin and ask about your health. A diagnosis is often made during that first visit. If a biopsy is needed, it is quick and done with local numbing. You will get results in a week or two.

Treatment

Treatment for psoriasis aims to reduce inflammation, slow skin cell growth, and remove scales. The right treatment depends on how much skin is affected, where the plaques are, and your overall health. Most people start with topical treatments and move to other options if needed.

Self-care at home

• Keep skin moisturized with fragrance-free creams or ointments
• Gently remove scales by soaking in warm water and using a soft cloth
• Avoid scratching—it can worsen plaques and cause infection
• Use mild soaps and avoid harsh chemicals
• Try stress-reduction techniques like meditation or breathing exercises

Medical treatments

Medical treatments for psoriasis include creams and ointments (such as corticosteroids or vitamin D analogues) applied directly to the skin. If these are not enough, doctors may recommend light therapy (phototherapy) using ultraviolet light. For moderate to severe cases, systemic medicines (taken by mouth or injection) that affect the whole body may be used. These are prescribed by a specialist and require monitoring. Never use over-the-counter products without checking with your doctor, as some can irritate the skin.

When is surgery considered?

Surgery is not typically used to treat psoriasis plaques themselves. However, if you develop joint damage from psoriatic arthritis, joint replacement surgery may be an option.

Living with this condition

Living with psoriasis means managing flare-ups and keeping your skin comfortable. You may need to adjust your skin care routine, choose gentle clothing, and avoid known triggers. Most people learn to recognize what makes their psoriasis better or worse.

Lifestyle tips

• Quit smoking and limit alcohol—both can make psoriasis worse
• Stay at a healthy weight to reduce stress on your skin and joints
• Protect your skin from cuts, scrapes, and sunburn, which can trigger new plaques
• Use a humidifier in dry weather to keep skin from drying out

Diet and exercise

There is no one diet that cures psoriasis, but eating a balanced diet rich in fruits, vegetables, and whole grains may help reduce inflammation. Some people find that avoiding processed foods, red meat, or gluten helps them. Regular exercise can help manage stress and keep your weight in check, which may reduce flare-ups.

Mental health and emotional wellbeing

Psoriasis can affect how you feel about your appearance and may cause anxiety or depression. The itching and discomfort can also disturb sleep. It is common to feel frustrated or self-conscious. Talking to a mental health professional or joining a support group can help.

Prevention

Psoriasis cannot be prevented because it is partly genetic. However, you may be able to reduce how often flares occur by managing stress, avoiding known triggers, and taking good care of your skin. Once you have psoriasis, staying on treatment and following a healthy lifestyle can help control it.

Complications

If left untreated

• Psoriatic arthritis—joint inflammation that can lead to permanent damage
• Skin infections from scratching or cracking
• Emotional problems like depression or low self-esteem
• Increased risk of other health issues such as heart disease, diabetes, and high blood pressure

Long-term outlook

Psoriasis is a lifelong condition, but with proper care, most people can keep symptoms under control and live a full, active life. Treatment options are better than ever, and many people find a combination of therapies that works for them. Your outlook is hopeful—aim to work closely with your healthcare provider and be patient as you find the best approach for you.

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