Psoriasis improves with a combination of topical treatments, trigger management, and, for moderate-to-severe cases, medications that calm the overactive immune response driving the disease. What works best depends on how much skin is affected and how your body responds, but most people start with creams or ointments applied directly to plaques and build from there.
Topical Treatments: The Starting Point
Prescription-strength corticosteroid creams and ointments are the most widely used first-line treatment. These come in seven potency classes, from mild hydrocortisone (available over the counter at 0.5% to 2.5%) all the way up to ultra-high-potency formulations prescribed for thick, stubborn plaques. Your doctor will match the potency to the location: stronger formulations for tough areas like elbows and knees, milder ones for sensitive skin on the face, groin, or skin folds. Long-term use of potent corticosteroids can thin the skin, so they’re often used in cycles rather than continuously.
Vitamin D-based creams (calcipotriene and calcitriol) are a common second option, used alone or paired with a corticosteroid. They slow the rapid skin cell growth that causes plaques. Topical retinoids, which are derived from vitamin A, also help normalize skin cell turnover in mild to moderate psoriasis. For delicate areas where corticosteroids aren’t ideal for long-term use, calcineurin inhibitors offer an alternative that avoids skin thinning.
Over-the-Counter Options
Two ingredients available without a prescription can meaningfully reduce scaling and discomfort. Salicylic acid, typically in concentrations of 2% to 10%, works as a keratolytic, meaning it softens and loosens the thick, scaly buildup on plaques so that other treatments can penetrate more effectively. Coal tar, used at concentrations of 2% to 8%, slows skin cell growth and reduces inflammation, itching, and scaling. One review from the American Academy of Family Physicians noted that coal tar appears to be even more effective than prescription vitamin D creams for some patients. Coal tar products come as shampoos, creams, and bath solutions, though many people find the smell and staining off-putting.
Combining the two, sometimes with a moisturizing base like petrolatum, is a long-standing approach. Thick emollients applied immediately after bathing also help lock in moisture and reduce cracking.
Light Therapy
Narrowband UVB phototherapy is one of the most effective treatments for widespread psoriasis. It involves standing in a light booth that delivers a specific wavelength of ultraviolet light. Most patients attend three sessions per week. Twice weekly is less effective, and once weekly doesn’t work. Plaques typically start thinning by around 12 sessions, and by 30 sessions most people see 75% improvement or better. A full course runs between 10 and 40 treatments depending on severity.
Phototherapy works well for people who have psoriasis covering too much skin for topical treatments to be practical, but not severe enough to require systemic medication. The main downside is the time commitment of visiting a clinic multiple times per week for several months.
Systemic Medications for Moderate-to-Severe Cases
When psoriasis covers large areas of the body or significantly affects quality of life, oral medications that work throughout the body become an option. Methotrexate, one of the oldest systemic treatments, is taken once weekly at doses that suppress the immune activity fueling skin cell overproduction. It requires regular blood work to monitor liver function. Apremilast works differently, blocking a specific enzyme involved in inflammation, and is taken as a daily pill with a gentler side-effect profile.
The biggest shift in psoriasis treatment over the past two decades has been biologic medications, which are injected or infused and target very specific parts of the immune system. The most effective current biologics block either IL-17 or IL-23, two signaling molecules that play central roles in psoriasis inflammation. Drugs targeting IL-17 can clear skin rapidly, though the response may begin fading within about 16 weeks if treatment is stopped. Newer dual-targeting biologics maintain near-complete clearance for longer, around 18 to 24 weeks after discontinuation.
A notable recent development is icotrokinra, the first oral medication that precisely blocks the IL-23 receptor. Approved by the FDA in March 2026 for adults and adolescents with moderate-to-severe plaque psoriasis, it achieved clear or almost clear skin in roughly 70% of patients at 16 weeks in clinical trials. It’s taken once daily on an empty stomach, and its side-effect rate was within about 1% of placebo through the first 16 weeks, with headache and nausea being the most common complaints. This fills a gap for patients who want the targeted effectiveness of a biologic without injections.
Weight Loss and Diet
Body weight has a direct, measurable relationship with psoriasis severity. For each one-unit increase in BMI, the risk of more severe psoriasis rises by about 7%. Obesity also makes biologic treatments less effective: people with a high BMI have 60% higher odds of an inadequate response to certain biologics compared to those at a normal weight, with each additional BMI point increasing the chance of treatment failure by 6.5%.
The good news is that losing weight produces real improvements. In one clinical trial, patients with a BMI over 27 who followed a low-calorie diet for 16 weeks lost an average of about 35 pounds and saw meaningful reductions in psoriasis severity compared to a control group. Another study combined calorie restriction with exercise over 20 weeks and found a 48% reduction in psoriasis scores in the intervention group, nearly double the 25.5% improvement seen in controls.
Dietary pattern matters too. Research links a Mediterranean-style diet, rich in extra virgin olive oil, fish, vegetables, legumes, fruits, and nuts, with lower psoriasis severity. Red meat intake is correlated with worse outcomes. For people who test positive for certain gluten antibodies, a gluten-free diet for three months has been shown to reduce psoriasis area and severity scores, though this benefit doesn’t appear to extend to everyone with psoriasis.
Common Triggers to Manage
Stress is the single most commonly reported psoriasis trigger. It doesn’t cause psoriasis, but it activates the immune pathways that worsen it. Finding a stress-management approach that works for you, whether that’s exercise, therapy, meditation, or simply better sleep, can reduce flare frequency.
Other well-established triggers include infections, particularly strep throat, which is closely linked to guttate psoriasis and often triggers its first appearance in children. Any illness that activates the immune system, from bronchitis to ear infections, can set off a flare. Cold weather is another frequent culprit because of reduced sunlight, lower humidity, and drier indoor air. Skin injuries of all kinds, including scratches, sunburns, bug bites, and even vaccinations, can cause psoriasis to appear at the site of the wound through a process called the Koebner phenomenon.
Alcohol and smoking are less universally reported but worth noting. Some people find that reducing alcohol intake noticeably calms their skin. Smoking is associated with both a higher risk of developing psoriasis and more severe disease in those who already have it.
Building a Treatment Plan That Works
Psoriasis treatment isn’t one-size-fits-all, and most people end up using a combination of approaches. Someone with a few small plaques might do well with a potent corticosteroid cream and coal tar shampoo. Someone with widespread disease might need phototherapy or a biologic, plus lifestyle changes to reduce triggers and improve treatment response. The condition tends to cycle between flares and periods of relative calm, so flexibility matters. Treatments that work during a flare (high-potency steroids, for instance) may differ from what you use for long-term maintenance (vitamin D creams, moisturizers, trigger avoidance).
Weight management deserves special emphasis because it’s the one intervention that simultaneously improves skin, boosts treatment effectiveness, and addresses the cardiovascular risks that come with the systemic inflammation psoriasis causes. Even modest weight loss can shift outcomes in a meaningful direction.