Beauty by Light
Skin Science Journal · Evidence & Expectations
Beyond the
breakout.
Red Light Therapy for Acne Scars: Does It Help Scars and Post-Acne Marks?
The pimples have settled. The marks have stayed. Understanding what remains is the first step towards choosing a treatment that makes sense.
The considered answer
Red light therapy has research supporting some skin-rejuvenation outcomes, and studies of home red and blue LED devices suggest benefits for active acne. Neither finding establishes that a home LED mask removes pitted acne scars. Evidence for post-acne redness and pigmentation is developing, with important limits on how early findings apply to facial skincare.1, 2, 3
If your main concern is a flat red or brown mark, your next decision differs from that of someone with an indentation or a raised scar. A useful routine begins with that distinction.
01 · Identify what remains after acne
Acne scars and acne marks are different concerns
People often use “acne scars” to describe everything a breakout leaves behind. Clinically, colour changes and changes in skin structure are different. A mark can also sit over a scar, so the categories are not mutually exclusive.4
| Concern | Typical appearance | The useful distinction |
|---|---|---|
| Post-inflammatory erythema, or PIE | A flat pink, red or purplish area | A colour change associated with the aftermath of inflammation. |
| Post-inflammatory hyperpigmentation, or PIH | A flat brown or grey-brown patch | Excess pigmentation following inflammation. |
| Atrophic acne scar | A depression or uneven contour | A structural change; includes ice-pick, boxcar and rolling scars. |
| Hypertrophic or keloid scar | A raised, firm area | A different pattern of scarring that needs a different treatment approach. |
This table is an orientation guide, not a way to diagnose your skin from a photograph. If you are unsure what you are seeing, an assessment can prevent months spent pursuing the wrong outcome.
Try describing your goal precisely: “I want this brown patch to fade” is more useful than “I want my scars gone.” It makes the treatment claim easier to evaluate and the result easier to track.
02 · Read the evidence at the right level
Does red light therapy work for acne scars?
The answer depends on what is being called a scar and which device is being discussed. Research on active pimples, general skin rejuvenation, experimental pigmentation and surgical wounds answers different questions.
| Research | What was tested | What the findings mean for this article |
|---|---|---|
| Home LED acne review, 2025 1 | Six randomised trials involving 216 participants with mild-to-moderate acne; red, blue or combined devices | Supports improvement in acne lesions under the studied conditions. It did not establish removal of existing acne scars. |
| Skin-rejuvenation trial, 2014 2 | Defined polychromatic light systems; 30 sessions, twice weekly; skin appearance, roughness and collagen-density measurements | Supports certain rejuvenation outcomes for those systems. It was not a trial of pitted acne scars or the Beauty by Light mask. |
| PIE/PIH pilot, 2025 3 | Ten healthy participants; UV-induced redness and pigmentation on thigh skin; medical 830 nm and 590 nm LED protocols | Provides preliminary evidence for selected outcomes. The model was not naturally occurring facial acne marks, and follow-up was short. |
| Surgical-scar trial, 2022 5 | An 830 nm LED device used early after thyroid surgery, compared with a sham device | Suggests a role in a particular postoperative setting. Early surgical-scar management does not establish treatment of longstanding acne indentations. |
The 2025 pigmentation pilot is especially relevant, but easy to overstate. The 830 nm therapeutic protocol produced lower changes in redness and melanin measurements than control. The 590 nm therapeutic protocol did not show the same significant differences. This is a reason for further study, not a validated home-mask prescription for acne marks.3
03 · Separate collagen research from scar correction
Can an LED face mask improve pitted acne scars?
Ice-pick, boxcar and rolling scars involve altered skin structure. Some rolling scars also involve underlying tethering. Dermatology guidance describes treatment selected for scar type, often using more than one approach.6
Red light's potential influence on skin biology makes it a reasonable research topic. However, a measured increase in collagen density in a rejuvenation trial cannot tell us how much an established acne depression will improve, or whether it will improve at all with a different home device.2
For someone considering an LED mask, the practical distinction is straightforward: assess any general skin-quality goal separately from the goal of changing a particular scar's depth or contour. Do not buy a mask solely on a promise that it will lift deep acne indentations.
04 · The red-mark question
Does red light therapy help post-acne erythema?
Persistent red marks can remain after the active blemish has resolved. There is interest in photobiomodulation for redness and tissue recovery, but results from laboratory work or other healing settings do not provide a reliable response rate for facial PIE.
The small 2025 pilot offers an early signal for 830 nm LED under its tested conditions. It cannot establish that most home-mask users will see red acne marks fade in four, six or eight weeks.3
If the marks are your main concern, look for evidence that measures their colour or extent, rather than a study counting active pimples. Redness that is spreading, painful or difficult to identify also deserves assessment rather than being assumed to be ordinary post-acne change.
05 · The brown-mark question
Can red or near-infrared light fade post-acne dark spots?
PIH concerns pigment. That makes it a different endpoint from reducing inflammatory lesions or improving skin roughness.
Dermatology guidance places photoprotection and management of the underlying cause at the centre of dark-spot care. Tinted sunscreen containing iron oxides can provide additional protection against sunlight's visible light, which matters for some pigmentation concerns.7
A reasonable approach is to assess sunscreen, ongoing breakouts and product tolerance before adding another device or several new actives. A pharmacist or clinician can help select pigment-focused skincare for your circumstances.
LED should not be presented as a universal pigment eraser. If you also have melasma, read our LED face masks and melasma guide before assuming every light mode suits your skin.
06 · Choose a wavelength for a defined goal
Red light versus blue light versus near-infrared
The colour name on a controller is only the beginning. Wavelength, output, session length and the evidence for the actual device determine how a claim should be assessed.
Blue and combined blue/red LED: the 2025 home-device review examined active acne, with blue wavelengths of 414–445 nm and red wavelengths of 630–670 nm across the included trials. Outcomes concerned lesions and overall acne assessment.1
Red light: relevant rejuvenation research includes defined light spectra and measured skin-quality outcomes. It should not automatically be relabelled as evidence of scar removal.2
Near-infrared: 830 nm appears in the experimental redness/pigmentation pilot and postoperative scar research. Those applications remain distinct from correcting established facial acne scars.3, 5
For a broader explanation, explore our LED face mask colours guide.
07 · Match professional treatment to scar type
Red light therapy versus microneedling, laser and subcision
Professional scar treatment is chosen after assessing the type and extent of scarring, skin tone, ongoing acne and treatment history. The American Academy of Dermatology describes options including laser resurfacing, microneedling, selected peels, fillers and scar surgery. Raised scars require a different approach.6
| Approach | Question worth asking at consultation |
|---|---|
| Laser resurfacing | Which scar patterns are being targeted, and what are the downtime and pigmentation considerations? |
| Professional microneedling | What change in texture is realistic, and how will progress be assessed? |
| Scar-release procedures, including subcision where appropriate | Is underlying tethering contributing to this indentation? |
| Selected peels or focal procedures | Is this suitable for my scar type and skin tone? |
| Home LED | What outcome is supported for this device, and how does it fit with the rest of my care? |
You do not need to commit to a procedure to ask these questions. A consultation can clarify what is treatable, what improvement would matter to you and what level of intervention you feel comfortable considering.
If LED is suggested after a procedure, obtain instructions from the treating clinician for your exact mask. Read our LED after laser, microneedling and chemical peels guide.
08 · Set a timeline that matches the evidence
How long does red light therapy take to work on acne scars?
There is no validated universal home-LED timeline for established acne-scar improvement. A trial's duration is not a guarantee of when an individual will see a particular result.
The home-device acne review reported improvement typically over four to twelve weeks, but that refers to active acne outcomes. The rejuvenation trial assessed changes after a defined series of treatments. Neither supplies an eight-week deadline for clearing post-acne marks or filling pitted scars.1, 2
Choose a review point according to your device instructions or clinical plan. Decide in advance what you will measure and avoid changing multiple treatments at once. If the desired improvement does not appear, reassess the approach instead of simply increasing exposure.
What before-and-after photographs can show
Photographs are useful records when their conditions are comparable. A warmer light can hide redness. Frontal light can flatten shadows around depressions. Moisturiser, makeup and camera processing can change apparent texture.
For a fair comparison:
- Use the same camera, distance, angle and lighting.
- Keep expression and skin presentation consistent.
- Date the images and record other treatments introduced.
- Track active pimples, colour changes and indentations separately.
- Note irritation or darkening alongside any improvement.
This is our documentation framework. It helps you interpret your experience; it does not turn a personal photograph into a controlled trial. See our LED before-and-after guide.
09 · Build a routine you can evaluate
How to fit an LED mask into post-acne skincare
The following is an organisational framework, not a universal treatment protocol. Prescribed treatment, product directions and your device instructions take priority.
Morning: cleanse as needed, use directed skincare and moisturiser, then suitable sunscreen. Cancer Council Australia recommends broad-spectrum, water-resistant SPF50 or SPF50+ sunscreen alongside clothing, shade, a hat and sunglasses.8
On an LED day: prepare skin and use eye protection exactly as your device specifies. If clean, dry, product-free skin is required, follow that direction. Use only the prescribed session length and frequency, then apply permitted skincare afterwards.
When assessing a new routine: keep a simple record of use, skin response and other changes. A routine is easier to judge when a new serum, exfoliant and device have not all started together.
For more detail, read what to apply under an LED mask. Product compatibility should be checked against your actual device rather than assumed from a general guide.
10 · Take pigmentation and safety seriously
Is red light therapy suitable for darker skin tones?
Suitability cannot be decided from skin tone alone. The device, dose, underlying condition and personal history matter.
High-fluence red LED safety trials recorded pigment changes and differences in tolerability associated with skin pigmentation. These experimental exposures do not establish the risk from ordinary home-mask use, but they show why “red light can never affect pigment” is too broad.9
Do not interpret the absence of ultraviolet light as a guarantee against every possible reaction. Seek advice if you have relevant light sensitivity, eye concerns, a pigment condition or medication-related questions. Stop using a device that causes persistent discomfort, eye symptoms or increasing redness or darkening.
Our LED face mask side-effects and safety guide explains the questions to raise before starting.
11 · Buy for the outcome you actually want
What to look for in an LED face mask in Australia
Use this editorial checklist to assess a product and its claims:
- A defined purpose. Is the claim about active acne, general skin appearance, pigmentation or established scars?
- Relevant evidence. Does the research measure that outcome, using the product or a meaningfully comparable system?
- Usable instructions. Can you identify preparation, session length, frequency, eye protection and situations where use is unsuitable?
- Transparent specifications. Ask for wavelength and output information where relevant; a larger LED count alone does not answer the clinical question.
- Accountable support. Can the supplier answer product-specific questions and explain its applicable Australian regulatory status?
- Proportionate expectations. Treat promises of complete scar removal or guaranteed results as claims requiring direct evidence.
Explore our Australian LED mask buying guide for further comparison questions.
12 · Frequently asked questions
Questions readers ask.
Can red light therapy remove acne scars completely?
Complete removal of established acne scars is not demonstrated by the home-mask evidence discussed here. Improvements in pimples, roughness or general skin appearance should be assessed separately from changes in scar depth.
Is an LED mask worth trying if my main concern is pitted scars?
Do not choose it solely on a promise of filling indentations. First clarify the type of scarring and ask what evidence supports the device for that outcome. A clinician can help assess other options.
Does blue light help old acne scars?
The home blue/red LED review concerns active acne. It does not establish that blue light lifts old depressions or clears longstanding pigmentation.1
Is near-infrared better than red light for acne marks?
There is not enough direct comparative evidence here to name a universal winner. The 830 nm pilot provides an early signal in an experimental model, not a head-to-head facial home-mask recommendation.3
Can I use my mask every day to get faster results?
Use the schedule for your exact model. The reviewed trials used different devices and regimens, so frequency cannot be copied from one study to another product.1
Should I use retinol or an LED mask first?
Follow device preparation instructions and the directions for your skincare or prescribed treatment. If the mask requires product-free skin, do not apply retinol underneath it. Our red light therapy and retinol guide discusses routine considerations.
What if my acne marks look darker after treatment?
Pause use and reassess with appropriate advice. Record the change under comparable lighting and note sun exposure, new products and other treatments. Do not assume that worsening is a necessary stage of improvement.
Can I use LED immediately after microneedling?
Not on the basis of a general internet schedule. Ask your treating clinician when your specific home mask can be used and which setting is appropriate. Clinical LED protocols do not automatically transfer to home use.
Does red light help keloids?
When should I seek professional help?
If acne is deep or persistent, marks are difficult to identify, scars are raised or pitted, or the concern affects your confidence or daily life, an assessment can help. There is no need to wait through repeated unsuccessful purchases before asking.
The Beauty by Light view
Better skin decisions begin with a better question.
“Does red light help acne scars?” becomes much more useful when you can name the concern: an active breakout, a red mark, a brown patch or a change in contour.
LED has a place in the research conversation about acne and skin quality. Its value is strongest when the promised outcome matches the evidence and the routine suits the person using it. For post-acne skin, that means recognising encouraging findings without turning them into guaranteed scar correction.
If a home device fits your goals, compare its settings, instructions and intended use through the Beauty by Light LED mask collection. For deeper scarring, let an individual assessment guide the next step.
Explore the LED mask collection →Sources & editorial method
This is a focused educational review, not a systematic review or a clinical trial. It separates active-acne evidence, rejuvenation research, experimental pigment studies and surgical-scar research. Studies of other devices are not presented as clinical results for the Beauty by Light mask. We sell LED skincare devices, and readers should assess product claims independently.
- Ershadi S, Barbieri JS. At-Home LED Devices for the Treatment of Acne Vulgaris: A Systematic Review and Meta-Analysis. JAMA Dermatology. 2025;161(5):552–555. DOI: 10.1001/jamadermatol.2025.0019. Read source
- Wunsch A, Matuschka K. A Controlled Trial to Determine the Efficacy of Red and Near-Infrared Light Treatment in Patient Satisfaction, Reduction of Fine Lines, Wrinkles, Skin Roughness, and Intradermal Collagen Density Increase. Photomedicine and Laser Surgery. 2014;32(2):93–100. DOI: 10.1089/pho.2013.3616. Read source
- The Therapeutic and Preventive Effects of Light-Emitting Diode (LED) for Post-Inflammatory Erythema and Hyperpigmentation: A Pilot Study. Photodermatology, Photoimmunology & Photomedicine. 2025. DOI: 10.1111/phpp.70003. Read source
- American Academy of Dermatology. Acne scars: Overview. Read source
- Photobiomodulation therapy with an 830-nm light-emitting diode for the prevention of thyroidectomy scars: a randomized, double-blind, sham device-controlled clinical trial. 2022. Read source
- American Academy of Dermatology. Acne scars: Consultation and treatment. Read source
- American Academy of Dermatology. How to fade dark spots in darker skin tones. Read source
- Cancer Council Australia. Advice on how to choose, apply and store sunscreen. Read source
- Safety of light emitting diode-red light on human skin: two randomized controlled trials. Read source
General education, not a diagnosis or personalised treatment plan. Follow your device instructions and obtain individual advice where needed. Editorial portraits and product photographs are illustrations, not clinical before-and-after evidence.