Psoriasis can’t be permanently cured, but it can be controlled well enough that your skin stays clear for months or even years at a time. The right approach depends on how much of your body is affected and how your skin responds to treatment. Most people with mild to moderate psoriasis manage it with topical products alone, while more widespread or stubborn cases may need light therapy, oral medications, or injectable biologics.
Topical Treatments for Mild to Moderate Cases
For most people, topical therapy is the starting point. Corticosteroid creams and ointments reduce inflammation and slow the rapid skin cell turnover that causes plaques. The American Academy of Dermatology recommends topical corticosteroids as a first-line treatment for plaque psoriasis on most body areas. They come in a range of strengths, from mild formulations safe for the face and skin folds to potent versions for thick plaques on elbows and knees.
The main drawback of steroids is that long-term use can thin the skin. That’s where steroid-sparing agents come in. Vitamin D-based creams work nearly as well as mid-strength steroids for mild to moderate plaques. Applied twice daily, one common formulation reduced psoriasis severity scores by about 48%, compared to 41% with once-daily use. These creams are also better tolerated on sensitive areas like the face, groin, and armpits. Many dermatologists recommend alternating between steroid and non-steroid creams to get the benefits of both while reducing the risk of skin thinning over time.
Retinoid creams (derived from vitamin A) are another steroid-free option that can be used alone or layered with other topicals. Calcineurin inhibitors, originally developed for eczema, also work on psoriasis in sensitive skin folds where steroids are risky.
Over-the-Counter Options
If your psoriasis is limited to a few small patches, over-the-counter products can make a noticeable difference. Salicylic acid softens and lifts scales so that other treatments can penetrate the skin more effectively. In one pilot study, a 6% salicylic acid foam reduced scalp psoriasis severity scores from 15.3 to 3.0 after four weeks. Coal tar, one of the oldest psoriasis remedies, slows skin cell growth and reduces itching and inflammation. A coal tar gel cleared or markedly improved scalp psoriasis within five days in one study, and patients who switched to a coal tar shampoo maintained that improvement for a median of eight months.
Thick, fragrance-free moisturizers are underrated. Keeping plaques hydrated reduces cracking, itching, and visible flaking. Apply them immediately after bathing to lock in moisture.
Light Therapy for Moderate to Severe Psoriasis
Narrowband UVB phototherapy is one of the most effective treatments available and works by slowing the overactive immune response in the skin. A typical course involves three sessions per week, each lasting about 15 to 30 minutes, with at least 24 hours between visits. Most people need 20 to 36 sessions to see significant clearing, which translates to roughly 7 to 12 weeks of treatment.
Clearance rates at the end of an initial course land in the 60 to 70% range, comparable to many oral and injectable medications. Once your skin clears, session frequency is gradually reduced to once a week for maintenance. The commitment is real, since you’ll need to show up consistently for weeks, but the treatment avoids the systemic side effects of pills or injections. For scalp psoriasis specifically, handheld UVB devices and fiber-optic combs can direct light through the hair to reach plaques directly.
Oral Medications
When topical treatments and light therapy aren’t enough, oral medications can dial down the immune overactivity driving psoriasis from the inside. Methotrexate is the most commonly prescribed oral option worldwide. It works by interfering with the rapid division of skin and immune cells, reducing inflammation across the body. It’s typically taken once a week and requires periodic blood tests to monitor liver function.
Apremilast takes a different approach, blocking a specific enzyme involved in inflammation. It’s recommended for moderate to severe psoriasis and doesn’t require the same lab monitoring as methotrexate. Cyclosporine is reserved for severe, resistant cases because it’s a powerful immune suppressant that works quickly but carries more significant side effects with long-term use, including kidney damage and high blood pressure.
Biologic Injections
Biologics are the most targeted treatments available. Rather than suppressing the immune system broadly, they block specific proteins that drive psoriasis inflammation. The newest and most effective biologics target two key immune messengers called IL-17 and IL-23.
IL-23 inhibitors have particularly convenient dosing schedules. After an initial loading phase, some require an injection only once every 8 to 12 weeks. IL-17 inhibitors are typically injected every 2 to 4 weeks after the loading period. All are self-administered at home using prefilled syringes or auto-injectors, similar to insulin pens. Biologics are generally reserved for moderate to severe psoriasis and are often considered when other treatments have failed, though updated guidelines increasingly support using them earlier in the course of disease.
Scalp Psoriasis Needs a Different Approach
The scalp is one of the most common and frustrating places for psoriasis to appear, partly because hair makes it harder to apply treatments and partly because thick scales can resist penetration. Foam, gel, spray, and solution formulations work better here than standard creams. A betamethasone valerate foam showed significantly greater improvement in redness, scaling, burning, and itching compared to standard corticosteroid lotions.
Combination products containing both a vitamin D analog and a corticosteroid in a foam vehicle have been shown to be safe and effective for up to a year of use. For heavy scaling, descaling first is important. A silicone-based solution can be sprayed onto the scalp, left on for several hours, then washed out, physically loosening and lifting scales without medication. Once the scale is removed, medicated shampoos and topical treatments can actually reach the skin beneath.
Weight Loss Can Improve Your Results
Body weight has a surprisingly strong connection to psoriasis severity. In clinical studies, patients with a BMI over 30 had nearly double the psoriasis severity scores of those at a normal weight (7.0 vs. 3.9). The relationship isn’t just correlational. People with a BMI of 35 or higher have a 63% greater risk of developing psoriasis in the first place.
Losing weight actively improves how well treatments work. In one trial, patients who combined a low-calorie diet with medication and lost 5 to 10% of their body weight achieved significantly better skin clearance than those on medication alone. Another study found that four weeks of calorie restriction alongside topical steroids produced greater psoriasis improvement than steroids by themselves, with the added benefit of improved cholesterol and triglyceride levels. You don’t need a specific diet plan. No particular diet (Ornish, South Beach, or others) has shown a clear advantage over simple calorie reduction for psoriasis outcomes.
Triggers That Make Psoriasis Worse
Psoriasis flares don’t always happen randomly. Several well-documented triggers can set them off or make existing plaques worse. Skin injuries, even minor ones like cuts, sunburns, or bug bites, can trigger new plaques at the site of damage. This phenomenon is common enough that it has its own name (the Koebner response). Streptococcal throat infections are another classic trigger, particularly for a type of psoriasis that appears as small, droplet-shaped spots across the torso.
Psychological stress is a major factor. Studies have found that both acute crises and ongoing family stress can trigger the initial onset of psoriasis and provoke flares in people who already have it. Smoking and heavy alcohol use both worsen outcomes. In one observational study of 150 patients, smoking and drinking habits were among the factors that prevented people from reaching a 75% improvement in their psoriasis scores with standard treatment. Certain medications can also trigger flares, including beta-blockers (used for blood pressure and heart rate), lithium (used for mood disorders), and some immune-stimulating drugs.
Keeping a simple log of your flares and what preceded them, whether it was a stressful week, a cold, a change in medication, or a few heavy nights of drinking, can help you identify your personal triggers and avoid them where possible.