The main treatments for psoriasis depend on how much skin you have affected and how severe it is

Psoriasis treatment falls into three categories: topical (creams and ointments you apply to skin), systemic (pills or injections that work throughout your body), and phototherapy (controlled light exposure). Which one your doctor recommends depends on whether you have a small patch or widespread plaques, whether it's affecting your joints, and whether previous treatments worked for you. Most people start with topical treatments. If those don't work or you have more than 10 percent of your body covered, your doctor will likely move to systemic medications or light therapy.

There is no cure for psoriasis, but these treatments can clear your skin completely or reduce symptoms to the point where they barely affect your life. The goal is finding what works for your body, because response varies widely—a treatment that clears one person's skin may do nothing for another.

Key Takeaways

  • Topical steroids and non-steroid creams are the first-line treatment for mild to moderate psoriasis and work best on smaller areas of skin.
  • Systemic medications like biologics target your immune system and work throughout your body, used when topical treatments fail or psoriasis covers large areas.
  • Phototherapy uses UVB or PUVA light and requires multiple sessions per week at a dermatology clinic or hospital.
  • Your dermatologist will adjust your treatment based on how your skin responds, so the first medication you try may not be the one you stay on.
  • Certain triggers—stress, infections, some medications, and skin injuries—can worsen psoriasis, and avoiding them can reduce flare frequency.

Topical treatments: creams, ointments, and foams you apply directly

Topical corticosteroids are the most common first treatment. They reduce inflammation and slow skin cell growth. Strength varies from mild (hydrocortisone) to very potent (clobetasol), and your doctor will prescribe based on where the psoriasis is and how thick the plaques are. Face and skin folds need weaker steroids because the skin is thinner. You apply them once or twice daily, usually for 2 to 4 weeks, then taper down to avoid side effects from long-term use.

Non-steroid topicals include calcineurin inhibitors (tacrolimus, pimecrolimus) and vitamin D analogues (calcipotriene). These work differently than steroids and can be used longer without the same risks. Vitamin D creams are often combined with topical steroids for better results. Coal tar and salicylic acid are older treatments still used, especially for scalp psoriasis—they're messier and slower but inexpensive and effective for some people.

Topical treatments work best on plaques smaller than a few inches across. If you have psoriasis on more than 10 percent of your body or on your palms, soles, or genitals, topicals alone usually won't be enough. Your dermatologist may combine a topical with phototherapy or move to systemic medication.

Systemic medications: pills and injections that treat psoriasis throughout your body

Biologics are the most effective systemic treatment and work by blocking specific parts of your immune system that drive psoriasis. Common ones include TNF inhibitors (adalimumab, etanercept, infliximab), IL-17 inhibitors (secukinumab, ixekizumab), and IL-23 inhibitors (guselkumab, risankizumab). Most are injections you give yourself at home every 2 to 4 weeks, though some are infusions at a clinic. They can clear skin completely in many people, but they cost thousands of dollars per month and require monitoring for infections and other side effects.

Conventional systemic medications like methotrexate, acitretin, and cyclosporine are older drugs that suppress immune function more broadly. They're cheaper than biologics and work for many people, but they require regular blood tests to watch for liver or kidney damage. Methotrexate is often a first choice for moderate to severe psoriasis, especially if it affects your joints.

Systemic medications take weeks to months to show full results. Your dermatologist will start at a low dose and increase gradually while monitoring your response. If one biologic stops working after months or years, switching to a different one often works—your body doesn't become resistant to the entire class.

Phototherapy: controlled light treatment at a clinic

Narrowband UVB (NB-UVB) is the most common phototherapy. You stand in a light box for a few minutes, usually 2 to 3 times per week. It takes 8 to 12 weeks to see significant clearing, and you need to continue treatment to maintain results. It's effective for widespread psoriasis and doesn't carry the systemic side effects of oral medications, but it requires a time commitment and access to a dermatology clinic or hospital with the equipment.

PUVA (psoralen plus UVA) involves taking a light-sensitizing medication (psoralen) by mouth or topically, then exposing your skin to UVA light. It's more effective than UVB for some people but carries a higher risk of skin cancer with long-term use, so it's usually reserved for cases that don't respond to UVB.

Excimer laser targets specific plaques with concentrated UVB light, useful if you have only a few problem areas. It's faster than whole-body phototherapy but more expensive and not covered by all insurance plans.

Combination therapy and switching treatments

Your dermatologist may combine treatments for faster or better results—for example, a topical steroid plus phototherapy, or a systemic medication plus a topical for stubborn plaques. If one treatment stops working or causes side effects, you'll switch to another. This is normal and expected; psoriasis treatment is often trial-and-error until you find what your body responds to.

Some people need to rotate treatments to prevent your skin from becoming resistant. Others stay on the same medication for years with good results. Your dermatologist will adjust based on how your skin looks and how you're tolerating the medication.

Triggers to avoid and lifestyle changes that reduce flares

Stress, infections (especially strep throat), skin injuries, and certain medications (like beta-blockers and lithium) can trigger or worsen psoriasis. While you can't always avoid these, recognizing your personal triggers helps you prepare. Some people find that keeping skin moisturized, avoiding very hot showers, and managing stress reduces flare frequency.

Alcohol and smoking may worsen psoriasis for some people. Weight loss can improve symptoms if you're overweight. These aren't treatments, but they can make the treatments you're using work better and reduce how often you flare.

What to expect at your dermatology appointment

Your dermatologist will examine your skin, ask about your medical history and other medications, and discuss how psoriasis is affecting your life. They'll explain the pros and cons of each treatment option and what to expect in terms of timing and side effects. Be honest about whether you can commit to phototherapy appointments or remember to inject yourself weekly—this affects which treatment makes sense for you.

Bring a list of any medications you're taking, including over-the-counter ones and supplements. Some interact with psoriasis treatments. If you've tried treatments before, tell your dermatologist what worked, what didn't, and why you stopped—this saves time and helps them avoid repeating failed approaches.

Frequently Asked Questions

How long does it take for psoriasis treatment to work?

Topical steroids can show results in 1 to 2 weeks. Systemic medications and phototherapy typically take 8 to 12 weeks to clear skin significantly. Biologics often work faster than conventional systemic drugs, sometimes showing improvement in 4 to 6 weeks, but full clearing may take 3 to 4 months.

Can I use topical steroids long-term without problems?

Potent topical steroids used continuously for months can thin skin and cause other side effects, especially on the face or skin folds. Your dermatologist will have you taper down after a few weeks or use them intermittently. Non-steroid topicals like vitamin D creams can be used longer without the same risks.

What happens if my psoriasis treatment stops working?

This happens with some medications after months or years of use. Your dermatologist will switch you to a different treatment—either a different class of biologic, a conventional systemic medication, or a combination approach. Switching is routine and doesn't mean you've run out of options.

Do I need to see a dermatologist, or can my regular doctor treat psoriasis?

Your primary care doctor can diagnose psoriasis and prescribe topical treatments. For moderate to severe psoriasis or if topicals aren't working, a dermatologist has more expertise with systemic medications and phototherapy and can monitor you more closely for side effects.

Is there anything I can do to prevent psoriasis flares?

Identify your personal triggers—stress, infections, skin injuries, certain medications—and avoid them when possible. Keep skin moisturized, avoid very hot showers, manage stress, and stay consistent with your treatment. These won't prevent all flares, but they reduce frequency and severity for many people.