Red light therapy shows some early promise for psoriasis, but the evidence is limited and it is not a standard treatment. Most research so far comes from animal studies, and dermatology guidelines still center phototherapy recommendations around ultraviolet (UV) light, not red or near-infrared wavelengths. If you’ve seen claims online that red light panels can clear plaques, the science isn’t there yet to back that up confidently.
What the Research Actually Shows
The strongest finding to date comes from lab research, not human trials. In a mouse model of psoriasis, red LED light at 660 nanometers partially reduced clinical severity and improved the microscopic appearance of skin lesions. That’s encouraging as a proof of concept: it suggests red light can influence the inflammatory processes driving psoriasis at a cellular level. But “partially attenuates symptoms in mice” is a long way from “clears plaques in people.”
Red light (typically in the 620 to 700 nm range) and near-infrared light (700 to 1,100 nm) work by penetrating the skin and stimulating energy production inside cells. This can reduce inflammation and promote tissue repair in other contexts, which is why researchers have been curious about its effect on psoriasis, a condition defined by overactive inflammation and rapid skin cell turnover. The theory is sound. The clinical proof for psoriasis specifically remains thin.
How It Differs From Proven Phototherapy
This is where many people get confused. “Light therapy” for psoriasis usually means narrowband UVB phototherapy, a well-established treatment that uses ultraviolet light to slow the overproduction of skin cells. It typically requires three sessions per week for about three months, with each session lasting seconds to a few minutes. The American Academy of Dermatology and the National Psoriasis Foundation include narrowband UVB in their joint clinical guidelines as a recommended treatment.
Other proven options include excimer laser therapy, which delivers a concentrated UVB beam to small, stubborn plaques (especially on the scalp) over 10 to 12 sessions, and PUVA therapy, which pairs a light-sensitizing medication with UVA light over 20 to 25 sessions. These treatments have decades of clinical trial data behind them.
Red light therapy operates at completely different wavelengths and through different biological mechanisms. The AAD guidelines do acknowledge visible light as a phototherapy category, but the level of evidence and recommendation strength is not comparable to UVB-based treatments. Treating red LED panels as interchangeable with medical phototherapy is a mistake.
Safety Considerations
Red light therapy is generally considered low-risk, which is part of its appeal. It doesn’t carry the skin cancer concerns associated with UV-based treatments. But “low risk” doesn’t mean risk-free, and there are a few situations where it can cause problems.
If you take any medication that increases your skin’s sensitivity to light, red light therapy may not be appropriate. Some common drugs, including certain antibiotics and acne medications, fall into this category. Conditions that make skin sensitive to light, such as lupus, can also worsen with red light exposure.
People with darker skin tones should be especially cautious. Research shows that darker skin is more sensitive to visible light, including red light, than lighter skin. This increased sensitivity can trigger hyperpigmentation, producing dark spots that tend to be more intense and longer-lasting than those caused by UV exposure. The American Academy of Dermatology recommends talking to a dermatologist before using an at-home red light device if you have a darker skin tone.
At-Home Devices vs. Clinical Treatment
Most people asking about red light therapy for psoriasis are considering at-home LED panels or handheld devices, not clinical treatments. These consumer devices vary enormously in power output, wavelength accuracy, and build quality. A panel advertised as “660 nm” may emit a broad spectrum that only peaks near that wavelength, and its actual energy delivery to the skin may be a fraction of what’s used in research settings.
There are no standardized dosing guidelines for red light therapy in psoriasis. Researchers studying other conditions typically measure doses in joules per square centimeter, but no consensus exists for psoriatic skin. Without knowing how much energy your device actually delivers, you’re essentially guessing at a protocol.
This doesn’t mean at-home devices are useless for skin health broadly. Some people report reduced redness or improved skin texture. But for a chronic inflammatory condition like psoriasis, anecdotal improvement is hard to separate from the natural waxing and waning of flares.
Where Red Light Therapy Fits Right Now
Red light therapy sits in an early, uncertain category for psoriasis. The biological rationale makes sense: it reduces inflammation, promotes cellular repair, and doesn’t carry UV-related risks. Animal studies support that rationale. But without robust human clinical trials showing measurable plaque clearance, it can’t be recommended as a primary or standalone treatment.
If you’re already managing psoriasis with proven therapies and want to try red light as a complement, the risk is generally low for most people. Just be aware of the photosensitivity concerns mentioned above, and don’t replace treatments that are actually working with something that remains unproven. For moderate to severe psoriasis, established phototherapy, topical treatments, and biologic medications have far stronger track records.