A new international study reveals a surprising and concerning reality for people living with psoriasis: even when skin symptoms disappear after treatment with biologic medications, many individuals continue to experience “invisible” inflammation throughout their bodies. Hidden inflammation may persist despite visible symptom relief. This residual inflammation, researchers warn, is linked to higher risks of serious conditions like obesity, heart disease, and metabolic liver disorders.
The study, published in the Journal of Investigative Dermatology, analyzed health data from approximately 200 patients in the United States, Spain, and Sweden who had undergone one year of biologic therapy for psoriasis. While many participants saw major improvement or full clearance of their skin symptoms, 36% still had signs of systemic inflammation.
This inflammation—while no longer visible on the skin—continues to circulate in the bloodstream and can affect organs such as the heart and liver. It’s a reminder that psoriasis, long considered just a dermatologic issue, is fundamentally a systemic inflammatory disease.
Systemic risk: more than skin deep
Psoriasis is a chronic autoimmune disorder marked by an overactive immune response that speeds up skin cell turnover, leading to the formation of scaly, itchy plaques. But beneath the surface, the inflammation at the heart of psoriasis can also disrupt metabolic function, contribute to insulin resistance, and drive nonalcoholic fatty liver disease.
Compared to participants without residual inflammation, those affected by it in the study were more likely to have abdominal obesity and metabolic dysfunction–associated steatotic liver disease (MASLD), a chronic liver condition caused by fat buildup due to impaired metabolism.
“When someone takes medication that clears up their visible skin symptoms, we might assume everything is fixed,” said Dr. Faranak Kamangar, a dermatologist and chair of dermatology at the Palo Alto Medical Foundation. “However, this study found that there was still invisible inflammation that continues to circulate in their bloodstream even when the skin looks better.”
Why biologics aren’t a complete solution
Biologic drugs are among the most effective treatments for moderate-to-severe psoriasis. They target specific parts of the immune system to reduce inflammation and improve symptoms. But as this study demonstrates, they don’t always eliminate all inflammation.
Dr. Danilo Del Campo, a dermatologist at the Chicago Skin Clinic, who was not involved in the research, says the findings mirror what he sees in clinical practice. “I see this in practice with patients who maintain good skin control but still struggle with metabolic issues, which can be driven by this ongoing, nonvisible inflammation,” said Del Campo. “It highlights that psoriasis is not just a skin condition, but a systemic disease that can impact multiple organs and systems.”
While effective at symptom control, biologics may need to be supplemented with broader health strategies to manage the full impact of the disease.
Managing residual inflammation through lifestyle changes
Though the study only followed participants for one year and was relatively small, its findings emphasize the importance of comprehensive disease management. According to Del Campo, ongoing inflammation—even at low levels—requires attention beyond pharmaceutical intervention.
“This includes regular exercise, a balanced diet rich in anti-inflammatory foods, maintaining a healthy weight, and avoiding smoking and excessive alcohol,” he advises.
One of the most effective dietary approaches for reducing inflammation, experts say, is the Mediterranean diet. Rich in olive oil, fatty fish, vegetables, and nuts, this eating pattern has been shown to support metabolic health and reduce the burden of systemic inflammation.
Dr. Kamangar adds that stress management also plays a critical role in keeping inflammatory pathways in check. Techniques such as yoga, meditation, and deep breathing may help reduce stress-related flares and improve overall well-being.
Additionally, regular checkups with primary care providers are essential. “It is also important for patients to regularly follow up with their primary care provider to monitor overall health, as early detection and management of related conditions can significantly improve long-term outcomes,” said Del Campo. “In some cases, I might adjust a patient’s biologic regimen or consider additional therapies if residual inflammation is still a concern.”
Looking forward: treating the whole person
This study adds to a growing body of research emphasizing the systemic nature of psoriasis and the need to treat it as more than a skin-deep condition. For patients and clinicians alike, the takeaway is clear: visible skin improvement doesn’t always mean the disease is under control.
For more information on systemic effects of psoriasis, visit the National Psoriasis Foundation.
In the meantime, a dual focus on both medical therapy and sustainable lifestyle changes may offer the best chance at managing not only the external symptoms but also the silent, internal inflammation that can threaten long-term health.
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