Treatment for Psoriasis: Options by Severity

There's no cure for psoriasis, but treatment for psoriasis can clear symptoms for months or even years at a time. Options range from topical creams for mild, localized patches to light therapy and systemic medications, including biologics, for more widespread or severe disease.

Which treatment makes sense depends mainly on how much body surface area is affected, along with factors like cost, side-effect tolerance, and whether psoriatic arthritis is also present. Most people start with the least intensive option that's likely to work and step up if needed.

How Doctors Choose a Starting Point

Most people with psoriasis have limited disease, affecting less than 5% of their body surface area, and for them, topical therapy alone is usually enough to manage symptoms. For people with more than 20% of their body surface affected, or whose symptoms don't respond to topical treatment, doctors typically move to phototherapy or systemic medications.

Before finalizing a plan, doctors also check for psoriatic arthritis, since its presence can shift treatment toward options that address both skin and joint symptoms at once.

Topical Treatments (Mild to Moderate Psoriasis)

Topical treatments are usually the first line of defense for localized, mild-to-moderate psoriasis. Common options include:

Corticosteroids, available in creams, ointments, foams, and other forms, are among the most frequently prescribed topical treatments.
Vitamin D analogues, which help slow down excess skin cell production.
Coal tar and salicylic acid, older but still-used treatments that help reduce scaling.
Topical retinoids and calcineurin inhibitors, which target inflammation and cell turnover through different mechanisms.
Moisturizers, which aren't a treatment on their own but support skin barrier health alongside other therapies.

These treatments generally have fewer systemic side effects than oral or injected medications, which is part of why they remain the starting point for most people with limited disease.

Phototherapy (Light Therapy)

Phototherapy uses controlled ultraviolet light exposure to slow skin cell turnover and reduce inflammation, and it's often recommended when topical treatments alone aren't enough. Options include:

UVB phototherapy, which can treat single patches or more widespread psoriasis and is generally used first because of its safety profile.
PUVA (psoralen plus UVA) phototherapy, which combines a light-sensitizing medication with UVA light exposure and tends to carry a higher risk of side effects than UVB alone.
Excimer laser, a targeted form of UVB therapy that can treat specific patches with fewer sessions than traditional phototherapy.

Phototherapy side effects range from sunburn-like reactions and dry skin to, with long-term use, an increased risk of skin damage and skin cancer. It's typically administered or supervised by a dermatologist to manage these risks.

Systemic Treatments (Moderate to Severe Psoriasis)

For more extensive or treatment-resistant psoriasis, systemic medications work throughout the body rather than just on the skin's surface. Traditional oral systemic options include:

Methotrexate, which slows skin cell production and calms immune activity.
Cyclosporine, an immune-suppressing medication generally used for shorter periods due to potential effects on the kidneys and blood pressure.
Acitretin, an oral retinoid that reduces skin cell production but isn't recommended during pregnancy.

These medications tend to carry more significant side-effect considerations than topical treatments, so they're typically reserved for moderate-to-severe cases and require regular monitoring by a physician.

Biologics

Biologics are injected or infused medications that target specific parts of the immune system involved in psoriasis, rather than suppressing immune activity broadly. They're generally reserved for moderate-to-severe psoriasis and have shown higher effectiveness compared to older oral medications or phototherapy alone in current research.

Common biologic classes target inflammatory pathways such as TNF-alpha, IL-17, and IL-12/23, each interrupting the disease process at a different point in the immune response. Because biologics affect immune function, they carry an increased risk of infection, which is a key consideration when starting one.

Combination Approaches

Many treatment plans combine categories rather than relying on just one. Coal tar combined with UVB light (sometimes called Goeckerman therapy), or biologics paired with methotrexate, are examples of combination strategies used to improve results when a single treatment isn't fully effective on its own.

Daily Skin Care Alongside Treatment

Regardless of which treatment approach is used, basic daily skin care supports better outcomes. Bathing regularly and applying a heavy, ointment-based moisturizer afterward helps maintain the skin barrier and can reduce dryness and irritation between treatments.

What to Expect Going In

Treatment response varies by individual, and it's common to try more than one approach, or a combination, before finding what works best. Some treatments can induce remission lasting months to years, while others require ongoing use to maintain results. Cost, convenience, and personal risk tolerance for side effects all factor into which long-term plan makes the most sense.

Practical Takeaway

Start conversations with a dermatologist by describing how much of your body is affected and how your current routine, if any, is working. Most treatment plans begin with the least intensive option likely to help and adjust from there — so a therapy that didn't work for someone else with psoriasis isn't necessarily off the table for you, and one that worked for someone else isn't automatically the right starting point either.

FAQ

What is the most common treatment for psoriasis?
Topical treatments, including corticosteroids and vitamin D analogues, are the most common starting point since most people with psoriasis have limited disease affecting less than 5% of their body surface area.

When do doctors recommend biologics for psoriasis?
Biologics are typically reserved for moderate-to-severe psoriasis that hasn't responded well to topical treatments, phototherapy, or traditional oral systemic medications, since they carry more significant costs and infection-related risks.

Is phototherapy safe for psoriasis?
Phototherapy is generally considered safe under medical supervision, though it carries risks like sunburn-like reactions and, with long-term use, increased skin cancer risk. UVB phototherapy is typically used first because it has a better safety profile than PUVA.

Can psoriasis be cured with treatment?
No. There's currently no cure for psoriasis, but treatment can significantly reduce symptoms and, in some cases, produce remission lasting months to years.

Do I need a dermatologist for psoriasis treatment?
For mild psoriasis, a primary care doctor can often start topical treatment, but a dermatologist is generally recommended for phototherapy, systemic medications, or biologics, since these require more specialized monitoring.