Red Light Therapy for Wound Healing and Scars: What It Actually Does

This is the post where I'm most confident telling you the effect is real, because I've watched it happen on someone close to me.

A few years back a former partner of mine had a deep scar that had been bothering her for ages. Not painful, just visually a thing she didn't like, raised and discoloured, the kind of scar that doesn't really fade on its own no matter how long you wait. We started using red light therapy on it. Short sessions, regularly, over several months. The change was stark enough that I posted the before-and-after on social media at the time. I wasn't trying to sell anything with the post. I was just genuinely surprised at how much the appearance had improved.

I've also used red light on my own scars, particularly areas where the tissue around an old scar would feel weird (that tingling, slightly numb, slightly hypersensitive sensation that scar tissue often has) and noticed the strange feeling settle down over a few weeks of consistent use.

So when I write this post, I'm not pulling effects out of papers and hoping. I'm telling you about something I've watched work close-up.

Red light therapy (rødlysterapi) helps with wound healing and scars by activating fibroblasts, the cells that produce collagen and remodel tissue, stimulating new blood vessel growth (angiogenesis), reducing inflammation in the wound bed, and accelerating the overall repair timeline. For mature scars, red light supports remodelling of disorganised collagen into more normal tissue, improving both appearance and the strange sensations that scar tissue often produces. The strongest evidence is for fresh surgical wounds, post-operative healing, and the long-term remodelling of mature scars over weeks to months of consistent use.

The Scar Story That Convinced Me

I'll give you the proper version of the story I mentioned in the opener.

The scar in question was several years old. Deep. Raised in the way scars get when the wound was wide or under tension during healing. Discoloured in that pale pink way that doesn't really fade to skin tone. It was the kind of scar that the person who has it knows is there every time they look in the mirror, even if other people barely notice.

We did sessions on it consistently. Ten to fifteen minutes, close range, several times a week. Not every day, but consistently over a long period. Months, not weeks.

The change happened gradually enough that you almost didn't notice it day to day. But every few weeks, looking at it fresh, the difference was clear. The raised quality flattened out. The discoloration softened toward something closer to surrounding skin. The texture became more uniform. By the end of several months of consistent use, the difference between the before and after photographs was striking enough that I posted them. People who hadn't seen it in person assumed I'd taken the photos in different lighting. The change was real.

That's one person, on one scar, over several months. It's not a clinical trial. What it is, is what got me genuinely interested in this application of red light specifically, because the effect was bigger than I was expecting based on what I'd read at the time.

What's Actually Happening in the Tissue

When you put red light on a wound or scar, you're triggering several biological processes at once. Different parts matter depending on the stage of healing you're at.

If it's a fresh wound, you're working on the early inflammatory and proliferative phases. Red and near-infrared light increase ATP production in the cells responsible for repair, particularly fibroblasts and keratinocytes. Fibroblasts are the cells that lay down new collagen. Keratinocytes are the skin cells that close the wound. Both of them work better with more available cellular energy.

Light also stimulates angiogenesis, the formation of new blood vessels. A fresh wound needs blood supply to bring in oxygen and nutrients for the cells doing the rebuilding. The faster you can establish good vascularisation, the faster the wound heals.

The third early effect is on inflammation. Light dampens the excess inflammatory response without shutting down the necessary signaling for repair. You get the immune work that needs to happen, without the protracted inflammation that delays healing.

Move forward to the remodelling phase, which goes on for months or years after the wound is technically closed, and the picture changes. Now the scar tissue is being slowly reorganised. Initially, collagen in a scar is laid down in disorganised, random patterns. Over time, normal mechanical and biological signals reorganise it into something closer to normal tissue, though scars rarely return to fully normal structure. Red light appears to accelerate this remodelling process and improve the quality of the final tissue.

The research on this is solid. A 2019 review by Mosca and colleagues covered the mechanisms and applications across wound healing and scar treatment. A more recent 2022 systematic review in Lasers in Medical Science specifically looked at photobiomodulation for hypertrophic scars and keloids, finding consistent improvements in scar appearance, thickness, and patient-reported outcomes. Linked here.

For post-surgical wound healing specifically, several controlled trials have shown faster wound closure, reduced infection rates, and better cosmetic outcomes in treated groups compared to standard care. A 2018 meta-analysis on photobiomodulation for wound healing pulled this together. Here.

The Tingling Scar Thing

I want to talk about this separately because it's something I've experienced myself and customers ask about often. Scar tissue has nerves that healed in a slightly disorganised way along with the collagen. That's why old scars often have that strange quality where they feel slightly numb to touch but also slightly hypersensitive, or where the tissue around them tingles or feels off in some hard-to-describe way.

My own experience, and what customers report, is that consistent red light on a scar that has this tingling, hypersensitive quality tends to settle that sensation down over several weeks. The exact mechanism isn't fully worked out, but it likely involves the same processes that improve scar appearance (better tissue organisation, better local circulation, calmed inflammation) combined with some direct effects of light on peripheral nerve function that are being increasingly studied.

If you've got an old scar that still feels weird years after the original wound, this is worth trying. It's not dramatic, you don't put a panel on it and feel better instantly. You do it consistently for a few weeks, and the strange feeling tends to be less prominent. I won't promise it'll happen for everyone. I will say that out of the customers who've tried it for this specific reason, more report improvement than report nothing.

Different Scar Types, Different Realistic Expectations

It's worth being honest about which scars respond well and which don't.

Hypertrophic scars, the raised reddish scars that develop in some people after wounds, respond reasonably well to red light therapy according to the research. The mechanism makes sense. You're encouraging better collagen organisation and remodelling, both of which directly counter the abnormal tissue pattern.

Keloids, which are scars that grow beyond the boundaries of the original wound, are tougher. They have a more aggressive abnormal growth pattern and tend to be harder to address with any single intervention. Red light therapy may help as part of a wider treatment plan including other modalities, but expecting it to clear a keloid on its own is unrealistic.

Surgical scars in the post-operative window respond very well to red light therapy. This is one of the better-supported applications. Starting light therapy on a healing surgical incision, once the wound is closed and the surgeon has cleared the area for treatment, can significantly improve the final cosmetic outcome compared to letting the scar mature on its own.

Old scars, like the one in the story I told earlier, respond more slowly but can still show meaningful improvement with consistent long-term use. The older the scar, the longer the timeframe to see results. Several months of consistent use is realistic. A few weeks is not.

Stretch marks are a related category. They're not technically scars, they're a form of dermal damage from rapid stretching, but the underlying tissue process is similar. There's emerging evidence that red light therapy can improve their appearance, particularly for fresher stretch marks that are still in the red or purple stage rather than the older silver ones. Older stretch marks improve more slowly and the effect is usually modest.

Burn scars are an active area of research, with some encouraging results for both fresh burn wound healing and long-term scar remodelling. If you're dealing with burn scars, particularly large ones or ones from significant burns, this is something to discuss with your treating physician.

The Practical Protocol

Here's what works in practice based on the research and what I see customers actually doing.

For fresh surgical scars, once the wound is closed and the surgeon has cleared the area for treatment (which is typically once any stitches or staples are out and there's no infection), start with sessions of 5-10 minutes at moderate distance, on the scar and the surrounding tissue. Daily or every other day for the first month, dropping to a few times a week for the next couple of months. The window where you can most influence the final outcome is the first six months after the wound closes.

For mature scars, the protocol is similar but the expected timeline is longer. Daily or near-daily sessions of 10-15 minutes for at least two to three months before judging the result. Many people see initial changes in scar texture and color within the first few weeks, with more substantial remodelling happening over months.

For stretch marks, 10-15 minutes daily on the affected areas, with realistic expectations that fresher marks will respond better than older ones, and that the change will be gradual.

Distance matters. Too close and you may be over-dosing. Too far and the light delivered to the actual tissue is too low to drive the cellular effects. Most panels will have a recommended distance for various uses, though as I've said many times before, those recommendations are only as good as the measurement of the panel in the first place.

Where I Push Back on the Industry

Almost nobody selling red light panels in Norway specifically addresses the scar and wound healing application. Most of the marketing in this category focuses on pain, recovery, and skin appearance broadly. The wound healing application is one of the most evidence-supported uses, and yet it's one of the least talked about in retail.

I think part of this is because it's harder to make dramatic claims about scar treatment in advertising. The before-and-after images that retailers love are mostly skin appearance, fine lines, that sort of thing. Scar improvement happens slowly and the changes, while real and significant when you look at the photos side by side, aren't the instant transformation that makes good marketing.

The other thing I keep running into is people who bought a panel for general use, didn't realise scar treatment was an option, and ask me later whether they can use what they already own for it. The answer is usually yes. The same wavelengths and broadly similar doses work for skin, wound, and scar tissue applications. You don't need a specialist device. You need a panel that delivers a reasonable dose at the distance you're using it.

If you're not sure whether what you've got is capable, send me a message. We can work through what the panel is probably delivering and what protocol would make sense. You don't have to buy from me to get that conversation. If we work out that what you have isn't suitable for what you want to do, we can talk about options, but the first step is just understanding what you actually own.

I test every panel I stock with a spectrometer before it goes on the site. I've sent things back when the readings didn't match the claims. Not fun conversations with suppliers, but necessary ones. The longer story on why panel specs are usually fictional in this industry is here.

What I'd Honestly Tell a Friend

If a friend asked me about red light therapy for a scar or wound, here's what I'd say.

If it's a fresh surgical wound, talk to your surgeon first. Most modern surgeons will be open to red light therapy once the wound is closed and there's no infection, but you want to confirm before you start. The window where you can most influence the final outcome is in the first few months after the wound closes, so don't waste it.

If it's an old scar, be patient. Real change takes weeks to months. Take photos at the start so you have something honest to compare against. People are bad at remembering exactly how things looked a few months ago, and gradual changes can be invisible day to day but obvious in side by side photos.

If it's a tingling, weird-feeling scar, this is one of the genuinely satisfying applications because the sensation often improves before the appearance does. You'll know within a few weeks of consistent use whether it's helping the strange feeling, even if visual changes take longer.

If you've got an existing panel and you're not sure it'll work for this, ask me. Send me the model. I'll tell you honestly what it's likely delivering and whether you can make it work or whether something different would serve you better. If you want to look at what's available, the red light therapy panel collection and the portable and specialist devices are good starting points for scar and wound applications.

Where This Connects to Other Skin and Tissue Work

If you've read the skin health and collagen post, you'll see the biology overlaps significantly. Scar tissue is essentially abnormally organised skin tissue. The same fibroblast stimulation that improves skin appearance and supports collagen production in healthy skin also drives the remodelling of scar tissue toward more normal structure.

For broader context on what photobiomodulation does across different tissue types, the 2025 half-year research review covers the year's significant studies including wound and tissue work.

This article is for educational purposes only. It is not medical advice. If you have a surgical wound, significant injury, or scarring that concerns you, please consult a qualified healthcare professional before starting any treatment. Do not apply red light therapy to an open or infected wound without medical guidance.

Frequently Asked Questions

Does red light therapy actually reduce the appearance of scars?

Yes, the research supports red light therapy as effective for improving scar appearance, particularly for hypertrophic scars, surgical scars, and stretch marks. The mechanism involves stimulating fibroblasts to remodel disorganised scar collagen into more normal tissue structure, alongside improved local circulation and reduced inflammation. The effect is real but gradual. Most people see meaningful changes over weeks to months of consistent use, with older scars taking longer than newer ones to respond. Keloids are the toughest scar type to address and usually require a multi-modal approach.

How long does it take for red light therapy to work on a scar?

Fresh surgical scars often show changes in texture and colour within the first few weeks of treatment. Mature scars typically need at least two to three months of consistent use before meaningful improvement is visible. The older the scar, the longer the timeframe. Daily or near-daily sessions of 10-15 minutes are typical. Taking before-and-after photos at the start is valuable because gradual changes can be invisible day to day but obvious in side by side comparison after several weeks.

Can I use red light therapy on a fresh surgical scar?

Once the wound is fully closed and your surgeon has cleared the area for treatment, yes. Most modern surgeons are open to red light therapy after the immediate post-operative period, but you should always confirm before starting. Do not apply red light to an open or infected wound without medical guidance. The window where light therapy can most influence the final cosmetic outcome is in the first six months after wound closure, so starting reasonably soon after the surgeon clears the area is sensible.

Kan rødlysterapi hjelpe på operasjonsarr?

Ja, rødlysterapi støttes av forskning som effektiv for å forbedre utseendet til operasjonsarr, særlig når den startes tidlig etter at såret er lukket og kirurgen har klarert området for behandling. Mekanismen er at lyset stimulerer fibroblaster til å reorganisere arr-kollagen til mer normal vevsstruktur, samtidig som lokal sirkulasjon bedres og betennelse dempes. Forvent gradvis forbedring over uker til måneder med konsekvent bruk. Best resultat ser man når behandlingen begynner i de første månedene etter at såret er lukket.

Will red light therapy work on old scars?

Yes, but it takes longer than treating fresh scars. Old scars have had years to consolidate their disorganised collagen pattern, so the remodelling process takes longer to produce visible change. Two to three months minimum of consistent use is realistic, and meaningful improvement may continue over six months or more. Taking photos at the start gives you an honest baseline to compare against. The effect is gradual but real for many people.

References

Mosca RC, Ong AA, Albasha O, Bass K, Arany P. Photobiomodulation Therapy for Wound Care: A Potent, Noninvasive, Photoceutical Approach. Advances in Skin and Wound Care. 2019. https://pubmed.ncbi.nlm.nih.gov/31299009/

Photobiomodulation for hypertrophic scars and keloids: a systematic review and meta-analysis. Lasers in Medical Science. 2022. https://pubmed.ncbi.nlm.nih.gov/35907082/

Photobiomodulation therapy for wound healing: systematic review and meta-analysis. Lasers in Medical Science. 2018. https://pubmed.ncbi.nlm.nih.gov/29732475/

Hamblin MR. Mechanisms and applications of the anti-inflammatory effects of photobiomodulation. AIMS Biophysics. 2017. https://pmc.ncbi.nlm.nih.gov/articles/PMC5523874/