Red light therapy is a possible add-on treatment for acne, especially mild-to-moderate inflammatory acne. A 2025 systematic review and meta-analysis included six randomized studies involving 216 people. The results suggest that light therapy can improve some acne, but the benefit is usually modest. Red light therapy should not replace established treatments such as adapalene or benzoyl peroxide.
Devices that combine red and blue LED light have stronger support for acne than red light alone.
Red Light Therapy for Acne at a Glance
| Question | Evidence-based answer |
|---|---|
| Does it work? | It may reduce inflammatory and non-inflammatory acne lesions, but results are usually moderate rather than dramatic. |
| Who is most likely to benefit? | People with mild-to-moderate inflammatory acne, including red pimples and pustules. |
| Red light or blue light? | A combined red and blue LED device is generally a more suitable acne choice than a red-only device. |
| How long does it take? | Studies commonly reported improvement after about 4 to 12 weeks of repeated use. |
| What does it not treat well? | Deep cysts, nodules, acne scarring and acne driven mainly by clogged pores. |
| Should it replace adapalene or benzoyl peroxide? | No. Dermatology guidelines support several topical acne medicines, while evidence for light-based devices remains insufficient for a strong recommendation. |
How Effective Is Red Light Therapy for Acne?
The evidence points to a moderate benefit, not complete clearing.
The 2025 meta-analysis found that LED therapy produced greater improvement than control treatments in:
- Inflammatory lesions: 45.3% greater percentage change
- Non-inflammatory lesions: 47.7% greater percentage change
- Investigator-rated acne severity: 45.7% greater percentage change
These figures describe the difference between the treatment and control groups. They do not mean that every person will see acne improve by 45%.
The studies were small and used different devices, wavelengths and treatment schedules. They also did not establish the best wavelength or dose. The devices used red LED wavelengths between 630 and 670 nanometers, blue light between 414 and 445 nanometers, or both types of light.
The American Academy of Dermatology's acne guideline says there is not enough evidence to recommend for or against light-based acne devices. Red light therapy remains a possible add-on, but it has not replaced topical retinoids, benzoyl peroxide or other established treatments.
Red Light Versus Blue Light for Acne
Red and blue light are used for different reasons:
- Red light is mainly used for its potential anti-inflammatory effects.
- Blue light is intended to target acne-associated bacteria through light-sensitive compounds.
- Red and blue light together may address both inflammation and acne-associated bacteria.
The 2025 review found benefits with red-only, blue-only and combination devices. Some studies showed greater improvement with combination devices, although the overall evidence base remains small.
For acne, a combination device designed and cleared for that purpose is a more defensible choice than a generic red-light panel marketed mainly for wrinkles.
What Type of Acne Can Red Light Therapy Treat?
Mild-to-Moderate Inflammatory Acne
Red light therapy may be worth considering for recurring red pimples and pustules. The American Academy of Dermatology says visible-light devices can treat pimples, although results vary and complete clearing is uncommon.
Blackheads and Whiteheads
The evidence is less consistent for blackheads and whiteheads. The American Academy of Dermatology says visible-light devices should not be relied on for these types of acne.
The 2025 meta-analysis did report improvement in non-inflammatory lesions, but those results came from a small group of studies that used different devices and treatment schedules. For acne caused mainly by clogged pores, treatments such as adapalene or salicylic acid are more directly suited to the problem.
Cystic Acne, Nodules and Acne Scarring
Red light therapy should not be the main treatment for deep, painful cysts or nodules. These forms of acne can scar and often require prescription treatment.
Light therapy also does not reliably remove established acne scars.
Is an At-Home Red Light Mask Worth Trying?
An at-home LED device may be reasonable if you have mild-to-moderate acne and want a non-drug add-on. It should not be your only treatment if your acne is persistent, severe or scarring.
If you buy one, look for:
- FDA clearance for acne, not only clearance for wrinkles or general skin appearance. The FDA classifies certain over-the-counter devices that use red and blue light for mild-to-moderate acne vulgaris.
- A red-and-blue LED setting if acne is the main goal.
- Clear treatment instructions, including exposure time and frequency.
- Eye protection, if the manufacturer's instructions require it.
- A return policy, since FDA clearance does not guarantee that a particular device will work well for every person.
FDA clearance means that a device has met the applicable regulatory requirements. It does not prove that the device will deliver superior results.
Consistency matters. Studies generally assessed repeated use over several weeks, not one-off treatments. Follow the manufacturer's instructions rather than increasing exposure time to try to speed up results.
How Safe Is Red Light Therapy?
Short-term use appears to have a generally favorable safety profile. Acne LED studies reported side effects such as mild dryness, redness, irritation and discomfort.
The American Academy of Dermatology also warns that some light treatments can cause burns, blistering, pigment changes and scarring, especially when devices are misused or treatments are too strong.
Speak with a dermatologist before using an at-home device if you:
- Take medication that increases light sensitivity
- Have lupus or another light-sensitive condition
- Have a darker skin tone and are prone to post-inflammatory hyperpigmentation
- Have painful, deep or scarring acne
Visible light can cause more intense or longer-lasting dark spots in some people with darker skin tones.
What Should You Use Alongside Red Light Therapy?
A dermatologist may combine light therapy with standard acne treatment. Common options include:
- Adapalene or another topical retinoid for clogged pores and some pimples
- Benzoyl peroxide to reduce acne-associated bacteria
- Salicylic acid for blackheads and whiteheads
- Azelaic acid for acne and lingering dark marks
Do not add several potentially irritating products at once. A simple cleanser, non-comedogenic moisturizer and daily sunscreen can help limit irritation while you assess whether the LED device is helping.
Final Verdict
Red light therapy is best treated as an optional add-on for mild-to-moderate inflammatory acne. If you try an at-home device, choose one cleared for acne and consider a red-and-blue LED model rather than a red-only wrinkle mask.
Deep, painful, scarring or persistent acne needs a dermatologist's assessment. Light therapy alone is not a reliable treatment for those cases.