Underlying Causes
Psoriasis is an immune-mediated disease, meaning the body's immune system overacts and mistakenly attacks healthy tissues. Specifically, white blood cells called T-cells become active and trigger other immune responses, which leads to swelling and the rapid turnover of skin cells. In a healthy body, skin cells grow deep in the skin and rise to the surface about once a month; in psoriasis, this process happens in just a few days. The dead skin cells do not shed quickly enough, building up into thick patches. Genetics play a significant role, as the condition often runs in families, suggesting that certain inherited genes make a person more likely to develop the disease.

Triggers and Risk Factors
While the genetic predisposition exists, environmental factors often trigger the onset or worsening of symptoms. Common triggers include infections, such as strep throat or skin infections, and injury to the skin, such as cuts, bug bites, or severe sunburn. High levels of stress can also initiate a flare-up. Cold, dry weather tends to make symptoms worse, while warm sunlight may improve them. Certain lifestyle factors, including smoking and heavy alcohol consumption, are known risk factors. Additionally, specific medications, such as lithium, high blood pressure drugs, and antimalarial medications, have been linked to triggering psoriasis.

Prevention and Management of Flare-ups
Primary prevention of psoriasis is not currently possible because the genetic causes cannot be altered. However, individuals can reduce the frequency and severity of flare-ups by avoiding known triggers. Strategies for reducing disease progression include:

Strategies to Reduce Severity

• Managing stress through relaxation techniques or therapy.
• Protecting the skin from injury and avoiding harsh scratching.
• Maintaining a healthy lifestyle by avoiding smoking and limiting alcohol intake.
• Keeping the skin well-moisturized to prevent dryness and cracking.

Signs and Symptoms
The symptoms of psoriasis can vary depending on the type and severity of the condition. The most common form, plaque psoriasis, presents as dry, raised, red skin lesions (plaques) covered with silvery scales. These plaques may be itchy, burning, or sore. Other symptoms include dry, cracked skin that may bleed, and thickened, pitted, or ridged nails. In some cases, joints may become swollen and stiff. Symptoms can range from a few spots of dandruff-like scaling to major eruptions that cover large areas. The condition often goes through cycles, flaring for a few weeks or months, then subsiding for a time or even going into complete remission.

Diagnosis Methods
Clinicians typically diagnose psoriasis by examining the skin, nails, and scalp. A doctor will look for the characteristic signs of plaques and scales. To confirm the diagnosis and rule out other disorders, a healthcare provider may perform a skin biopsy. This involves taking a small sample of skin to be examined under a microscope. This helps distinguish psoriasis from other conditions that look similar, such as eczema or cutaneous T-cell lymphoma.

Differential Diagnosis
Psoriasis is often confused with other skin conditions due to similar appearances. It must be differentiated from eczema (atopic dermatitis), which usually causes intense itching and appears in skin folds; seborrheic dermatitis, which involves greasy scales; and fungal infections like ringworm. Accurate diagnosis is crucial because treatments for these conditions differ significantly.

Medications and Therapies
Treatment aims to stop skin cells from growing so quickly and to remove scales. Options range from topical creams to systemic medications. Topical treatments applied directly to the skin, such as corticosteroids, vitamin D analogues, and retinoids, are commonly used for mild to moderate cases. Phototherapy, or light therapy, involves exposing the skin to controlled amounts of natural or artificial ultraviolet light to slow skin cell turnover. For more severe or resistant cases, doctors may prescribe oral or injected medications that affect the whole body, such as methotrexate, cyclosporine, or biologics. Biologics target specific parts of the immune system to block the inflammation cycle.

Lifestyle and Self-Care
Self-care is an essential part of managing psoriasis. keeping the skin moist with heavy creams or ointments helps control scaling and pain. taking daily baths with colloidal oatmeal or bath salts can soothe inflamed skin. Avoiding known triggers, such as stress, smoking, and skin injuries, helps maintain remission. A healthy diet and maintaining a healthy weight may also improve treatment effectiveness, as systemic inflammation is linked to obesity.

When to Seek Medical Care
It is important to see a healthcare provider if skin issues persist or cause discomfort. Seek medical attention if:

• Symptoms become severe, widespread, or cause significant pain.
• The condition interferes with daily activities or causes emotional distress.
• Joint pain, stiffness, or swelling occurs, which could indicate psoriatic arthritis.
• Signs of infection appear, such as increased redness, swelling, warmth, or pus.

Severity and Course
Psoriasis severity is often categorized as mild, moderate, or severe based on how much of the body is affected and how much it impacts a person's quality of life. Mild psoriasis covers less than 3 percent of the body, moderate covers 3 to 10 percent, and severe covers more than 10 percent. The disease is chronic and lifelong, typically following a relapsing-remitting course where symptoms flare up and then subside. While some people may experience long periods of remission, the condition usually requires ongoing management.

Complications and Long-term Effects
Beyond the skin, psoriasis is associated with systemic inflammation that can affect other organs. A major complication is psoriatic arthritis, which causes joint damage and pain. People with psoriasis also have a higher risk of developing other chronic health conditions, including cardiovascular disease, type 2 diabetes, metabolic syndrome, and depression. These comorbidities emphasize the need for comprehensive care that looks beyond just skin symptoms.

Prognosis
While psoriasis itself does not typically affect life expectancy directly, the associated risks like heart disease can influence long-term health outcomes. However, with early diagnosis and appropriate treatment, particularly with newer biologic therapies, many patients can achieve clear skin and significantly reduce the risk of complications. Prognosis is generally good for managing symptoms, though a permanent cure is not yet available.

Impact on Activities and Mental Health
Living with psoriasis can be challenging and may affect various aspects of daily life. The visibility of the condition can lead to self-consciousness, social withdrawal, and depression. People may feel embarrassed about their skin, leading them to avoid swimming, gyms, or wearing certain clothing. The physical discomfort of itching and cracking skin can also interfere with sleep and concentration at work or school. Practical coping strategies include wearing loose, soft clothing to minimize irritation and using stress-reduction techniques to manage emotional triggers.

Questions to Ask Your Healthcare Provider
Being prepared for medical appointments can help patients better manage their condition. Useful questions include:

• What type of psoriasis do I have and how severe is it?
• What are the potential side effects of the treatment options you are recommending?
• Are there any lifestyle changes that could help improve my symptoms?
• How can I tell if I am developing psoriatic arthritis?
• Is it safe for me to use over-the-counter creams along with my prescription medication?

Q: Is psoriasis contagious?
A: No, psoriasis is not contagious. It is an autoimmune disease, meaning it cannot be spread from person to person through contact.

Q: Can psoriasis be cured?
A: There is currently no cure for psoriasis, but it can be effectively managed. Many treatments are available that can clear the skin and reduce symptoms significantly.

Q: Does diet affect psoriasis?
A: While no specific diet cures psoriasis, some people find that reducing alcohol and inflammatory foods may help. Obesity is a risk factor for more severe symptoms, so maintaining a healthy weight is beneficial.

Q: Is psoriasis just a skin condition?
A: No, psoriasis is a systemic disease caused by inflammation in the body. It is often associated with other health issues, such as psoriatic arthritis, heart disease, and diabetes.

Q: Can psoriasis affect only the nails?
A: Yes, it is possible to have psoriasis symptoms only on the nails, although it typically appears on the skin as well. Nail changes include pitting, discoloration, and separation from the nail bed.