Red light therapy is not a reliable treatment for dark spots. Some studies report lighter pigmentation, but results vary by device, wavelength, dose, and treatment schedule. A 2024 review found only nine relevant studies on low-level lasers or LEDs for melasma.
At a Glance
| Type of dark spot | Can red light help? | Better-supported approach |
|---|---|---|
| Acne marks or post-inflammatory hyperpigmentation | Possible, but evidence is limited | Treat the acne, use sunscreen, and consider azelaic acid or a retinoid |
| Melasma | Uncertain, and light may worsen it in some people | Tinted SPF 30+ with iron oxide and dermatologist-guided treatment |
| Sun spots or age spots | May produce modest cosmetic improvement, but it is not a targeted treatment | Sun protection and professional treatment if desired |
| A new, changing, bleeding, or unusual dark spot | No | Have it examined by a dermatologist |
Why Might Red Light Therapy Help Dark Spots?
Red light therapy might help some dark spots indirectly, but it does not selectively remove melanin.
Also called photobiomodulation, red light therapy uses red or near-infrared light to influence cellular activity. Researchers have studied it mainly for skin rejuvenation, inflammation, wound healing, and wrinkles.
Some clinical studies have reported lighter dark spots after red-light treatments. The American Academy of Dermatology describes research showing improvements in dark spots and overall skin appearance, including one study in which 90 patients received eight facial LED treatments over four weeks. The studies are difficult to compare because they use different devices, wavelengths, treatment schedules, and energy levels.
Red light does not target melanin in the same way as pigment lasers or intense pulsed light treatments. Any improvement may come from reduced inflammation, better skin healing, or broader benefits related to photoaging rather than direct pigment removal. This is an interpretation of the available evidence, not a proven explanation for every device.
What Does the Research Say About Red Light and Melasma?
The evidence is too limited to make red light a standard melasma treatment.
A 2024 integrative review identified nine relevant studies involving low-level lasers or LEDs. The review reported possible benefits from several wavelengths, including red light at 630 nanometers, amber light around 585 to 590 nanometers, and infrared light around 830 to 850 nanometers. The authors concluded that more well-designed clinical trials are needed to establish the best wavelengths, doses, and treatment schedules.
Evidence involving amber or infrared light does not show that a typical at-home red LED mask will fade melasma.
Melasma can worsen with visible light, especially in people with darker skin tones. The American Academy of Dermatology recommends tinted sunscreen containing iron oxide because it helps protect against visible light that can worsen melasma.
Can Red Light Therapy Make Dark Spots Worse?
Yes. Red light therapy can worsen pigmentation in some people.
The American Academy of Dermatology warns that people with darker skin tones may be more sensitive to visible light, including red light. This sensitivity can trigger hyperpigmentation, making dark spots more intense or longer-lasting.
A randomized safety study found mild hyperpigmentation in some participants after high-fluence red LED exposure. The study assessed safety rather than dark-spot treatment, so it does not show that normal home use will cause pigmentation. It does support caution with high-energy devices, particularly on skin of color.
Speak with a dermatologist before using red light therapy if you have:
- Melasma
- A history of post-inflammatory hyperpigmentation
- Medium to deep skin pigmentation
- Easily triggered pigmentation
- A device that causes heat, redness, burning, or irritation
Stop using the device if your skin becomes persistently red, darker, irritated, or painful.
What Works Better for Dark Spots?
Sunscreen, treatment of the underlying cause, and proven topical ingredients are better-supported starting points.
Use broad-spectrum SPF 30 or higher every day. Sunscreen helps prevent existing dark spots from becoming darker and helps reduce new pigmentation. For melasma or pigmentation affected by visible light, choose a tinted sunscreen containing iron oxide.
Treat the trigger. Acne, eczema, picking, burns, and irritation can continue producing post-inflammatory hyperpigmentation. Fading products are less effective if the underlying inflammation continues.
Consider a proven topical ingredient. The American Academy of Dermatology lists azelaic acid, glycolic acid, kojic acid, retinoids, vitamin C, and prescription treatments such as hydroquinone among the options used for dark spots. Irritating products can worsen pigmentation, so introduce one active ingredient at a time.
See a dermatologist for persistent or stubborn pigmentation. Professional options may include prescription creams, chemical peels, intense pulsed light, or laser treatment. These procedures can also cause post-inflammatory hyperpigmentation, especially in darker skin, so the treatment and settings need to be selected carefully.
Is It Worth Buying a Red Light Therapy Device for Dark Spots?
Usually not when dark spots are your only goal.
Red light therapy may be worth considering if you also want to address wrinkles, mild redness, or general skin quality and understand that pigment improvement is uncertain. Choose an FDA-cleared device from a reputable manufacturer and follow its treatment instructions.
FDA clearance indicates that a device has met safety requirements. It does not prove that the device will fade dark spots effectively.
When Does a Dark Spot Need Medical Evaluation?
A new, changing, bleeding, or unusual dark spot should be examined by a dermatologist rather than treated with red light.
Arrange a dermatology examination if a spot is:
- New
- Growing
- Bleeding
- Itching
- Painful
- Markedly different from your other spots
- Changing in size, shape, or color
These changes can occur with skin cancer, including melanoma.
Bottom line: Red light therapy may slightly improve some discoloration, but it is not a dependable dark-spot treatment. Use daily sun protection first, address the underlying cause, and seek professional advice before using red light if you have melasma, darker skin, or a history of pigmentation problems.