Red Light Therapy for Scar Tissue and Adhesions: What the Research Shows
Red light therapy for scar tissue has its closest evidence in two places: softer, thinner skin scars after surgery or burns, and better knee bend when light was added to rehab after a knee replacement. No study shows light breaking up scar tissue or releasing internal adhesions, so light sits alongside massage, stretching and your surgeon's or physio's plan. Below: the research, adhesions, stiff knees, timing, a massage routine and panel set-up.
Key takeaways
- In a 2023 trial of 40 people after knee replacement, adding 650 nm laser light to rehab from week 3 gave a knee bend of 87.0 degrees at six weeks, against 68.4 degrees with rehab alone. Alghamdi, 2023
- A 2026 scoping review gathered 7 trials with 297 people on burn, raised and surgical scars, using red light at 633 and 670 nm and near-infrared at 808 and 830 nm. Gaumond, 2026
- Adhesions form in more than 9 in 10 people after surgery that opens the abdomen, and most of them cause no symptoms. NIDDK
- Cleveland Clinic states that surgery is the only way to break up abdominal adhesions. Cleveland Clinic, 2024
- A 2018 review of 8 publications with 258 people found scar massage improved scar height, pliability, pain and thickness, with evidence the authors called preliminary. Ault, 2018
What is scar tissue, and how is it different from an adhesion?
Scar tissue is the dense, collagen-rich tissue the body lays down to close a wound, and it is stiffer than the tissue it replaces. An adhesion is scar-like tissue that joins two surfaces inside the body that would normally slide past each other.
MedlinePlus describes adhesions as "bands of scar-like tissue that form between two surfaces inside the body". MedlinePlus, 2026
| Type | Where it sits | What people notice | What the light research covers |
|---|---|---|---|
| Surface scar | The skin | Colour, height, texture | Small trials on surgical, burn and raised scars |
| Scar tissue beneath the skin | Skin and the layers just under it | Tightness, pulling, a scar that feels stuck down | Trials measuring scar thickness, firmness and pliability |
| Internal adhesions | Inside the abdomen or pelvis | Often nothing; sometimes long-lasting belly pain | Outside the light research; surgery is the only release |
| Arthrofibrosis | Inside a joint, often after knee replacement | A joint that will not bend or straighten fully | Closest evidence: light added to knee rehab |
For colour, height and stretch marks, see red light therapy for scars and stretch marks. This article is about the tight, stuck or stiff feeling beneath them.
Can red light therapy for scar tissue soften it or break it up?
No source shows light breaking up scar tissue under the skin or inside the body. What the research does show is softer, thinner skin scars in small trials, and scar-forming cells that slowed down under high doses of red light in the lab.
Those cells are fibroblasts. A University of California group exposed human skin fibroblasts in a dish to high doses of 633 nm red LED light. Mamalis, 2016 The cells grew more slowly, moved more slowly and made less collagen, without dying. Other lab studies of fibrosis report the same pattern. Robijns, 2022 These are cell results, not results in people.
In people, the 2026 review gathered 7 trials on skin scars. Gaumond, 2026 The authors suggest red light may suit early, shallow scars and near-infrared deeper or more mature scars, an idea still to be tested.
Red and near-infrared light reach deeper into tissue than blue light, and near-infrared reaches deeper than red. Every human trial here shone light onto the skin.
Does red light therapy help adhesions after abdominal surgery or a C-section?
Red light therapy for adhesions inside the abdomen has not been shown to release or prevent them, and surgery is the only way to break them up. Light on the skin over a healed scar has a different goal: how the scar itself feels, alongside massage and physio.
What official sources say about abdominal adhesions: NIDDK
- Often silent: most people have no symptoms; chronic belly pain is the most common one.
- Hard to see: imaging tests most often cannot show them.
- Release: surgery, used when adhesions cause symptoms or complications, and surgery can cause new adhesions.
Cleveland Clinic notes that "some studies suggest" soft tissue mobilisation can reduce adhesion-related pain. Cleveland Clinic, 2024
After hernia repair, one trial in the 2026 review found a thinner skin scar with 830 nm light: 0.11 cm against 0.19 cm. Gaumond, 2026 It measured the skin, not the mesh.
Can red light help a stiff knee or arthrofibrosis after a knee replacement?
The closest evidence is a 2023 trial in which light added to rehab from week 3 gave a better knee bend at six weeks than rehab alone. Diagnosed arthrofibrosis is a matter for the surgeon, who sets the plan.
Arthrofibrosis is "abnormal scarring of the joint" that limits movement. Abdul, 2015 Earlier studies put it at about 3 to 10% of knee replacements.
In the 2023 trial, 40 people had intensive rehab, and half also had 650 nm laser light on the skin around the knee, twice a week for 6 weeks.
- Knee bend: 87.0 degrees with light against 68.4 degrees without, at six weeks.
- WOMAC score: from 83.15 to 28.15 with light, against 82.75 to 48.50 without (lower is better).
Our knee replacement article covers the other knee trials. If your knee stops gaining bend despite the exercises, tell the surgical team early.
Can red light loosen a tight or numb C-section scar?
The studied tool for a tight C-section scar is hands-on scar work, and light can sit alongside it later. The panel is not for use while pregnant or breastfeeding; after birth, wait until you have finished breastfeeding and your doctor agrees.
A C-section scar can stick to nearby tissue, causing tightness, soreness and a pulling feeling. Kingston and Richmond NHS, 2024 The leaflet suggests massage at least 4 times a week for 5 to 10 minutes.
In a trial of 28 people with long-lasting pain after a C-section, four sessions of hands-on scar work eased pain and improved scar mobility. Wasserman, 2018 A hospital laser trial eased pain in the first days after a C-section, as our red light therapy after surgery article describes, though hospital schedules are not a home plan.
Numb skin may not register warmth well, so start further back with a shorter session and check the skin afterwards. As for massage, your surgeon, midwife or physio will tell you when.
Does red light help scar tissue after a tendon repair or with frozen shoulder?
After a finger tendon repair, laser light added to splinting and early exercise was linked with better finger movement at 2 months. For frozen shoulder, light has been studied for pain and function, not for breaking up adhesions or stretching the capsule.
In the tendon trial, 33 people (45 fingers) had laser from day 7, three times a week for 3 weeks. Saidi, 2019 Movement was best with the higher dose. Light does not repair a tendon, and a splint stays on unless the surgeon or hand therapist agrees. See red light therapy for tendon repair.
Movement comes back with stretching and time, and light sits alongside that work, as our frozen shoulder article explains.
What settings did the scar tissue trials use?
Every human trial below shone light onto the skin over the scar or joint, in a clinic. Courses ran from 4 sessions to 6 weeks, added to rehab or usual care.
| Trial | Light | Dose | Schedule | Start |
|---|---|---|---|---|
| Knee replacement, 40 people (Alghamdi, 2023) | 650 nm laser | 6 J/cm², 60 seconds per point | Twice a week for 6 weeks | Week 3 |
| Finger tendon repair, 33 people (Saidi, 2019) | Laser, wavelength not reported | 1 or 4 J/cm² | 3 times a week for 3 weeks | Day 7 |
| Hernia repair (in Gaumond, 2026) | 830 nm | 13 J/cm² per session | 4 sessions | Early after surgery |
The trials gave small doses. To stay near that range with a panel, use a shorter timer, turn each channel down from 100%, or step back to about 12 inches.
How soon after surgery can you use red light on scar tissue?
Only once the incision has fully closed, every stitch, clip, strip and drop of skin glue is gone, and your surgeon agrees. In the trials above, light started at day 7 after a tendon repair and at week 3 after a knee replacement.
- Not yet: a dressing still on, a scab, weeping, a gap in the line, or a drain hole that has not closed.
- Never: over stitches, staples, an open wound or broken skin.
- Supports: keep a splint, brace or compression stocking on unless the care team agrees.
- Implants: after a joint replacement, plates or mesh, ask the surgeon first.
Our after-surgery guide covers timing for each type of operation.
Should you use red light before or after scar massage or stretching?
Light first, then massage or stretches, is the practical order. It matches the frozen shoulder trial, where stretching followed each laser session, and the knee trial, where light was added to rehab.
- Prepare: take off silicone sheets, gel and creams so the skin is clean, dry and bare.
- Light: one panel session on the scar area.
- Massage: with a water-based cream, up to 10 minutes, a few times a day once fully healed. NHS, 2023
- Technique: firm pressure until the skin whitens, small circles, along and across the scar. Royal Berkshire NHS, 2026
- Silicone: back on clean, dry, healed skin; most products are reusable and keep working for six to eight weeks. Cambridge University Hospitals, 2025
Outdoors, keep the scar covered or use SPF 30 or higher for at least a year, as the NHS advises.
Does red light work on old scar tissue, and how long until it feels softer?
The skin-scar trials saw the clearest gains in scars under a year old, so a fresh scar is the better candidate. Give a fresh scar 3 to 4 weeks and an older scar 8 to 12 weeks before judging a home routine.
Scars also change on their own: one NHS trust says a scar is at its worst between 3 and 6 months, becomes softer and paler over 6 to 12 months, and can keep fading for up to two years. East and North Herts NHS, 2023
Keep simple notes: tightness out of 10 each week, how far the joint bends or how freely the scar slides under your fingers, and photos every 2 weeks in the same light.
How do you use a Kivorla panel on scar tissue?
Over a closed, healed scar and with your care team's agreement, start at about 12 inches with the channels dimmed for 5 to 10 minutes every other day. Build to 10 to 15 minutes per area, 3 to 5 times a week, at about 6 inches for a small scar or joint and about 12 inches for a broad area such as the abdomen.
The 9-Spectrum Red Light Therapy Panel carries 480, 590, 630, 660, 670, 810, 830, 850 and 1060 nm, each dimmable from 1 to 100%. Its 670 and 830 nm channels match wavelengths in the scar review.
- Position: hang it on a door or wall with the included door hook, pulley, hanging cables and screws, or stand it upright on the floor, centred at the height of the scar.
- Eyes: put the included goggles on before switching on with the controller, keep your eyes closed, and never aim the panel at your face.
- Channels: 630, 660, 670, 810, 830 and 850 nm on; 1060 nm optional; 480 and 590 nm at their lowest; pulse off.
- Timer: 1 to 30 minutes; if no time is set, the panel stops at 5 minutes. The surface stays at or below 40°C.
- Numb skin: start further back and shorter, and check warmth with a hand that has normal feeling. Warm is fine; hot means stop.
- Spacing: at least 6 hours between 30-minute sessions.
For a closed scar on the face, once the surgeon agrees, the 4-Wavelength Red Light Therapy Mask in its red mode at 50% brightness for 5 to 10 minutes every other day stays within the manual's limits; it is a full-face shell with an eye opening, so a jawline, under-chin or neck scar is a job for the panel.
Who should not use red light on scar tissue, and which signs need a doctor first?
Do not use the panel while pregnant, breastfeeding or preparing for pregnancy, or over broken skin. Signs of infection, a possible bowel blockage or a knee that stops improving need a doctor before any light.
- Precautions: not with epilepsy or seizures triggered by light, a thyroid condition or thyroid medication, or sunburn on the body in the past 2 weeks; the panel is not for Fitzpatrick skin types V or VI.
- Cancer: scar tissue after cancer surgery or radiation only with the oncologist's agreement, never over a known or suspected tumour.
- Medicines: some common after surgery, such as doxycycline, ciprofloxacin, ibuprofen and naproxen, can make skin sensitive to light. Our precautions rule out photosensitising medication, so check with your pharmacist or doctor first.
- Eyes: "Don't substitute sunglasses for protective goggles." AAD, 2024 See our red light therapy goggles guide.
See a doctor first, not light, for:
- Infection: a scar that is swollen, painful, warm or has pus: urgent GP or 111. NHS, 2023
- Bowel blockage: severe belly pain or cramps, major swelling or bloating, nausea or vomiting after abdominal surgery: emergency care. Cleveland Clinic, 2024
- Stiff knee: a replaced knee that stops gaining bend, or signs of a clot: the surgical team.
- Growing scar: a raised scar spreading beyond the original wound: GP or dermatologist.
Read the precautions before ordering. Standard shipping to the US, UK and Germany is free. Under our return and refund policy, returns are accepted within 30 days: an unopened device with its seals intact is refunded less a 10% restocking fee, and an opened device that is undamaged and complete is refunded less 20%.
Kivorla devices are general wellness devices, not medical devices, and are not intended to treat scar tissue, adhesions or joint stiffness. Ask your surgeon, midwife, GP or physio before using light on a scar, and keep the care they advise.