Red Light Therapy and Inflammation: The Science Behind How It Works

Living with eczema or psoriasis is exhausting in a way that is difficult to explain to people who have never had it. The itch that will not quit, the flares that arrive without warning, the cycle of treatment after treatment that works for a while and then stops. Most people with chronic skin conditions have tried a lot of things before they find what works for them.

Topical steroids, emollients, biologics - these are the tools dermatologists reach for most often, and they work for many people. But they all have limits. Steroids cause skin thinning with long-term use. Biologics are expensive and not suitable for everyone. The search for effective, low-risk complementary approaches is a legitimate one.

Red light therapy - or photobiomodulation (PBM) - is emerging as one of the more promising options in that category. The research is still growing, but what exists is more robust than most people realise.

Understanding Eczema and Psoriasis

Eczema and psoriasis are not the same condition, but they share enough common ground that the same therapeutic tools often apply to both.

Eczema (atopic dermatitis) is primarily an immune-driven condition. The skin barrier is compromised, allowing irritants and allergens in. The immune system responds with an inflammatory cascade, triggering itching, redness, and dry, cracked skin. It tends to flare and then settle, often triggered by environmental factors like stress, heat, or certain materials.

Psoriasis is an autoimmune condition where the immune system mistakenly accelerates the skin cell cycle. Cells that normally turn over in 3-4 weeks are pushed through in 3-4 days. The result is the rapid build-up of thick, scaly plaques - most commonly on the elbows, knees, scalp, and lower back.

Both conditions involve chronic inflammation driven by an overactive immune response. Both cause physical discomfort and, for many people, significant psychological impact. And both are conditions where anti-inflammatory approaches - from any direction - are worth exploring carefully.

How Red Light Therapy Helps Skin Conditions

The mechanism behind photobiomodulation is well-established at the cellular level, even if the full clinical picture is still being mapped.

When red light (around 660nm) reaches the skin, it is absorbed by cytochrome c oxidase - a photosensitive protein inside the mitochondria of skin cells. This stimulates mitochondrial activity, increases ATP production, and shifts cells into a state of heightened repair and regeneration.

For inflammatory skin conditions specifically, several mechanisms are relevant:

• Cytokine modulation. Red light has been shown to modulate the release of pro-inflammatory cytokines from macrophages and other immune cells. In eczema, where an exaggerated immune response drives the flare, this dampening effect on surface inflammation is significant.
• Deeper penetration with 850nm NIR. Near-infrared light at 850nm penetrates beyond the epidermis and upper dermis into deeper skin layers. This matters for psoriasis, where plaques can be thick and the inflammatory activity extends well below the skin surface.
• Cellular repair and regeneration. The increase in ATP production supports faster skin cell turnover to healthy states, and promotes the repair of the compromised skin barrier that is central to atopic eczema.
• Itch reduction. Studies suggest that photobiomodulation can reduce the neurological signals responsible for itching - one of the most debilitating symptoms of both conditions. The mechanism involves reduced local inflammation around sensory nerve endings in the skin.

The combination of surface-level red light and deeper-penetrating near-infrared is why dual-wavelength devices consistently outperform single-wavelength tools in the research.

What the Research Shows

The clinical evidence for photobiomodulation in inflammatory skin conditions is not theoretical. Several meaningful studies have now been published.

One of the most cited studies in atopic dermatitis involved 81 patients treated with low-level light therapy. Of those, 63 patients showed measurable reductions in itching, and 57 showed reductions in skin eruptions. These are not marginal improvements - they represent the kind of symptom relief that meaningfully changes quality of life for people managing this condition day to day.

For psoriasis, the research picture is equally encouraging. A body of clinical work on patients with recalcitrant (hard-to-treat) psoriasis - cases that had not responded adequately to conventional therapies - found clearance rates in the range of 60-100% following photobiomodulation treatment. These were cases specifically selected because they had been resistant to other approaches, which makes the results particularly notable.

Studies in both conditions consistently show:

• Improvements typically become visible within 4-8 weeks of consistent treatment
• Reductions in skin thickness in plaque psoriasis
• Decreases in allergy-related immune cells (eosinophils) in atopic skin
• Reductions in dead cell buildup and scaling
• Improved skin barrier function in eczema patients

The direction of the evidence is consistent. Red and near-infrared light reduces inflammatory activity in skin, supports cellular repair, and produces measurable clinical improvements in both conditions. The caveat is that most studies are relatively small, and larger randomised controlled trials are still underway.

Always consult a dermatologist before adding red light therapy to your skincare routine - particularly if you are currently using other treatments.

RLT vs Traditional Treatments

Red light therapy is not a replacement for conventional dermatology care. It is worth being direct about that.

Topical steroids and immunomodulators (like tacrolimus) are effective at rapidly controlling flares and remain the first-line tools for most patients. Biologics like dupilumab have transformed outcomes for people with severe atopic dermatitis in recent years. These treatments have strong evidence bases and should not be abandoned in favour of any complementary approach.

What red light therapy offers is a different angle of attack. Where steroids suppress immune activity pharmacologically, photobiomodulation appears to modulate it through cellular energy pathways. The two approaches are not mutually exclusive.

For many people, the appeal of red light therapy is what it does not do: it does not thin the skin with long-term use, does not carry the systemic risks of biologics, and does not require prescriptions or clinic visits. As a safe, non-pharmacological complement to an existing treatment plan - or as a maintenance tool during periods of remission - it sits neatly alongside conventional care.

Research suggests that combining red light therapy with standard topical treatment produces better outcomes than either approach alone, which aligns with how most dermatologists would frame complementary therapies generally.

Which Wavelengths Work Best for Skin Conditions

Not all red light devices are built the same, and wavelength selection matters.

660nm red light is the workhorse wavelength for surface skin conditions. It penetrates the epidermis and upper dermis, which is exactly where eczema-related inflammation and skin barrier disruption are concentrated. It stimulates fibroblasts, modulates cytokine release, and supports surface-level tissue repair.

850nm near-infrared adds the depth that 660nm alone cannot reach. For psoriasis patients dealing with thick plaques, NIR penetration is critical - the inflammatory activity driving plaque formation is not just on the surface. The deeper reach of 850nm allows photobiomodulation to work at the level where psoriatic plaques originate.

For both conditions, the combination of 660nm and 850nm together is more effective than either wavelength used in isolation. This is why the research consistently shows stronger results from full-spectrum red light devices compared to single-band tools.

How to Use Red Light Therapy for Eczema and Psoriasis

Consistency and patience matter more than intensity. Here is a practical starting framework.

Build up gradually:

• Start with shorter sessions - 5-10 minutes - particularly if your skin is actively flaring or sensitive


• As your skin adjusts, extend sessions to 15-20 minutes


• Rushing to maximum session length when skin is irritated can trigger a short-term reaction, so the gradual build is worth it

For isolated patches or small flare-ups, the Lumovex Sculpt Wand allows precise targeted treatment directly on the affected area without needing to set up a larger device.

Frequency:

• Aim for 3-5 sessions per week during the active treatment phase


• Consistent regular sessions will outperform occasional longer ones every time


• Most people find a daily or every-other-day routine easiest to maintain

Before each session:

• Ensure skin is clean and dry


• Remove any topical products - creams, emollients, or serums - before treatment


• Anything sitting on the skin surface can reduce light transmission to the deeper layers where the therapeutic action happens


• Apply your usual moisturiser or prescribed topical after the session, not before

Track your progress:

• Take photos at the start of treatment and every 2 weeks


• Progress is gradual and easy to miss day to day - photos make it visible over time


• Note itching levels, sleep quality, and flare frequency alongside visual changes

For facial eczema or psoriasis:
The Lumovex Spectrum Pro LED face mask delivers both 660nm and 850nm light evenly across the full face, which is useful when affected skin is spread across the cheeks, forehead, and jawline. It treats the entire surface in a single session without having to move a handheld device across the face.

For neck involvement - which is common in eczema - the Lumovex Spectrum Pro LED Mask and Neck Kit extends coverage to include the neck and upper chest in the same session.

For body coverage:
When psoriasis or eczema affects larger areas - the torso, limbs, or back - a full-size panel provides the coverage needed for efficient treatment. The Lumovex Pro Panel 540 covers a broad surface area and delivers both wavelengths simultaneously, making it well-suited to body-wide treatment sessions.

For psoriasis that concentrates on the lower back or torso - one of the most common areas affected - the Lumovex Red Light Therapy Belt wraps directly around the affected area for hands-free targeted sessions, delivering both 660nm and 850nm to the treatment site.

What to Expect Over Time

Red light therapy works with your skin's biology, not against it. The timescales reflect that.

Weeks 1-4: Most people notice little visible change in the first few weeks. Cellular changes are happening - inflammatory signals are being modulated, mitochondrial activity is up - but the surface does not yet show them. Some people notice a mild reduction in itch during this phase.

Weeks 4-8: This is typically when the first meaningful visible improvements appear. Redness may begin to reduce, plaques may start to thin, and flare frequency may decrease. Itching often improves noticeably during this window.

Weeks 8-12: For most consistent users, this is where the clearest results become visible. Skin texture improves, plaques become less prominent, and eczema-affected areas start to stabilise. The skin barrier shows signs of improved function.

Beyond 12 weeks: Ongoing maintenance sessions help sustain results. Many people with chronic skin conditions find that 3-4 sessions per week over the long term keeps flares less frequent and less severe.

The most reliable variable in all the research is consistency. Sporadic sessions over a few weeks will not show what regular, committed use over 2-3 months can achieve.

The Bottom Line

Red light therapy is not a cure for eczema or psoriasis. Anyone telling you otherwise is overpromising. But the research does suggest it is a meaningful complementary tool - one that works through legitimate biological mechanisms, has a strong safety profile, and produces measurable clinical improvements in conditions that are notoriously difficult to manage long-term.

For people who have cycled through topical treatments, who are looking for something to use alongside their existing care, or who want a low-risk option to help manage milder flares, the evidence justifies a serious look.