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Light That Heals: Low-Level Laser Therapy for Scar Management & Endometriosis

  • Jun 15
  • 7 min read

For anyone who has undergone cancer surgery, major gynaecological procedures, or colorectal surgery, the physical reminder often remains long after the operation: the scar. Scars are more than cosmetic. They can cause pain, tightness, restricted movement, numbness, and for many patients, significant psychological distress.[1] For those living with endometriosis, chronic pelvic pain and tissue inflammation add yet another layer of complexity.

As physiotherapists, we have a growing toolkit to support these patients, and one of the most exciting modalities within it is Low-Level Laser Therapy (LLLT), also known as Photobiomodulation (PBM). This post explores the science behind the 660 nm red laser probe and its role in scar management and endometriosis care.


Understanding the 660 nm Wavelength


The Omega 660 nm 50 mW Infra-Red Probe operates at a wavelength of 660 nm, placing it firmly within the red visible light spectrum. This is one of the most extensively researched wavelengths in photobiomodulation science.

At the cellular level, 660 nm light is absorbed by cytochrome c oxidase within the mitochondria, the energy-producing units of our cells. This triggers a cascade of biological effects:[2]

  • Increased ATP (cellular energy) production, fuelling tissue repair[2]

  • Modulation of inflammatory mediators, including reductions in TNF-α and IL-6[3]

  • Stimulation of fibroblast proliferation and collagen synthesis, essential for wound healing and scar remodelling[4][2]

  • Enhanced angiogenesis (new blood vessel formation), improving oxygen and nutrient delivery to healing tissues[5]

  • Modulation of Matrix Metalloproteinases (MMPs), enzymes that help remodel the extracellular matrix and reorganise collagen architecture[2]


A 2025 study using a 660 nm continuous red diode laser confirmed its efficacy and safety for scar management across recent surgical scars, old scars, and acne scars, with significant improvements in scar colour, size, and patient satisfaction (p < 0.01) and no adverse effects reported.[6]


Post-Operative Scar Management: Why It Matters

The Problem with Post-Surgical Scarring


Following any significant surgical procedure, whether mastectomy, hysterectomy, bowel resection, caesarean section, or laparoscopic surgery, the body lays down scar tissue as part of its natural healing response. While this is necessary, problems arise when:

  • Scar tissue becomes excessively thick, raised, or fibrotic (hypertrophic or keloid scarring)

  • Adhesions form internally, binding organs and tissues together and causing pain, restricted movement, or bowel and bladder dysfunction[7]

  • The scar becomes hypersensitive, numb, or painful due to nerve damage or entrapment

  • Restricted fascial mobility develops, affecting posture, core function, and pelvic floor dynamics


These consequences are particularly relevant for patients who have undergone oncological, gynaecological, or colorectal surgery, where incisions are often extensive and healing may be compromised by radiotherapy, chemotherapy, or immunosuppression.


How 660 nm LLLT Supports Scar Healing


LLLT at 660 nm has been shown to positively influence every phase of wound healing:

Inflammation phase: LLLT consistently demonstrates reductions in post-operative pain of 30–55% within the first 3–7 days post-surgery, along with reduced inflammatory biomarkers (TNF-α and IL-6) and increased VEGF expression (supporting new blood vessel growth).[3]

Proliferation phase: A meta-analysis of LLLT across a wide variety of skin wounds demonstrated a significant reduction in wound size (p < 0.0001), an increased rate of complete wound healing (p = 0.0003), and meaningful pain reduction (p = 0.02). The modal wavelength used across the included studies was 660 nm.[8]

Remodelling phase: This is where scar quality is determined. LLLT at 660 nm has been shown to increase procollagen secretion, reduce MMP-1 (collagenase) production, and promote organised collagen alignment rather than the disordered, dense collagen typical of pathological scars.[2] In vitro studies confirm that 660 nm light suppresses keloid fibroblast proliferation by modulating the cell cycle, downregulates TGF-β1 (a key driver of excessive scarring), and induces fibroblast apoptosis in pathological scar tissue via cytochrome c and caspase-3 activation.[9]

Clinical studies using 660 nm and 830 nm PBMT for keloid and hypertrophic scars have demonstrated enhanced skin elasticity, reduced pain, improved texture, and lower recurrence risk.[9]


Cancer Surgery and LLLT


For patients recovering from cancer surgery, including mastectomy, lumpectomy, lymph node dissection, or reconstructive procedures, LLLT offers specific benefits:

  • Reducing fibrosis and improving tissue flexibility: the light energy helps soften dense scar tissue and improve collagen alignment, leading to more pliable and mobile scars[10]

  • Decreasing pain and hypersensitivity: by modulating nerve activity, LLLT can reduce neuropathic sensations and improve comfort in the surgical area[10]

  • Supporting faster tissue healing: LLLT enhances cellular metabolism and increases blood flow, accelerating the healing process[10]

  • Safe for use over dressings: LLLT can be used immediately after surgery and over dressings such as silicone tape to optimise scar healing[10]


Patients often report improvement in scar texture and appearance, with reduced redness, thickening, and sensitivity after a series of treatments.[10]

PBM has also been explored in oncology settings for managing treatment-related complications including oral mucositis, radiation dermatitis, and lymphoedema, further demonstrating its versatility as a supportive modality in cancer care.[11]


Gynaecological and Colorectal Surgery


Patients recovering from major gynaecological surgery (hysterectomy, ovarian surgery, endometriosis excision) and colorectal surgery (bowel resection, stoma reversal) face unique challenges:

  • Abdominal and pelvic adhesion formation, which can cause chronic pain, bowel obstruction, and bladder dysfunction[7]

  • Pelvic floor dysfunction secondary to nerve damage, tissue disruption, or post-surgical immobility

  • Core weakness and altered trunk mechanics due to extensive abdominal incisions


LLLT can be incorporated into post-operative physiotherapy programmes alongside manual scar mobilisation, visceral mobilisation, core retraining, and pelvic floor rehabilitation. Scar mobilisation can typically begin from 4–6 weeks post-surgery, with LLLT applied alongside to promote tissue healing and reduce fibrosis.[12]


Endometriosis: A Role for LLLT


Endometriosis is a chronic inflammatory condition where tissue similar to the uterine lining grows outside the uterus, affecting approximately 1 in 10 women in Ireland.[13] It causes chronic pelvic pain, dysmenorrhoea, dyspareunia, fatigue, and can significantly impair fertility and quality of life.


How LLLT Can Help in Endometriosis


The mechanisms by which LLLT may benefit women with endometriosis align directly with the pathophysiology of the condition:

  • Anti-inflammatory effects: LLLT decreases pro-inflammatory markers that contribute to endometriosis progression and pain[14]

  • Pain modulation: LLLT modulates nerve activity, raising β-endorphin levels and normalising nerve fibre conduction, reducing pelvic pain signalling[15]

  • Improved blood flow: enhanced circulation ensures better oxygenation and nutrient delivery to pelvic tissues[16]

  • Tissue healing and adhesion management: supporting repair of tissues affected by endometriotic lesions and post-surgical adhesions[17]


What Does the Evidence Say?


  • A systematic review by Wójcik et al. (2022) on physiotherapy management in endometriosis identified LLLT as one of the physical therapy modalities with evidence for use in managing endometriosis-related symptoms.[17]

  • Thabet & Alshehri (2018) conducted an RCT investigating laser therapy for endometriosis and concluded that it was an effective method of pain alleviation, reducing adhesions, and improving quality of life in women with endometriosis.[18]

  • A pilot study by Zipper et al. (2021) investigated transvaginal photobiomodulation for chronic pelvic pain (including patients with endometriosis) and found significant and sustained pain relief up to 6 months post-treatment. The mean Short-Form McGill Pain Questionnaire score decreased from 19.7 at baseline to 8.2 at 6 months (p = 0.002, large effect size d = 1.9).[19]

  • A 2025 study by Hasanin et al. found that low-level laser therapy at sensitised acupoints effectively reduced chronic pelvic pain and improved quality of life in women, including those with endometriosis-related pain.[20]

  • An ongoing randomised controlled trial (NCT05540353) is specifically evaluating transvaginal LLLT for dyspareunia in endometriosis patients, reflecting the growing clinical interest in this area.[21]


It is important to note that while the emerging evidence is promising, the evidence base for LLLT specifically in endometriosis remains in its early stages. Further well-designed, larger-scale RCTs are needed to strengthen recommendations. However, the biological rationale is strong and the early clinical results are encouraging.


The Physiotherapist's Role: Bringing It All Together


What makes physiotherapy uniquely valuable in this space is that LLLT is never used in isolation. It is one component of a comprehensive, evidence-based treatment plan that may include:

  • Scar tissue mobilisation and myofascial release

  • Visceral mobilisation to address internal adhesions

  • Pelvic floor muscle retraining (both overactive and underactive patterns)

  • Core stability and abdominal rehabilitation

  • Pain neuroscience education

  • Graded exercise and return-to-activity programmes

  • Manual lymphatic drainage (particularly post-oncology)

  • Patient education and self-management strategies

The 660 nm laser probe is a non-invasive, painless, quick-to-apply modality that integrates seamlessly into a physiotherapy session, enhancing the outcomes of our hands-on and exercise-based interventions.


Conclusion


Whether the scar is from a mastectomy, a hysterectomy, a colorectal resection, or endometriosis excision, the journey doesn't end when the stitches come out. Post-operative scar management and chronic pain conditions like endometriosis require ongoing, skilled, and evidence-informed rehabilitation.

LLLT at 660 nm offers physiotherapists a safe, effective, and well-researched tool to accelerate healing, reduce pain and inflammation, improve scar quality, and support long-term recovery. Combined with the expertise of a specialist physiotherapist, it can make a meaningful difference to our patients' quality of life and functional outcomes.

If you are recovering from surgery or living with endometriosis and would like to explore how laser therapy could support your recovery, please don't hesitate to get in touch.


Recovering from surgery or living with endometriosis?

Low-Level Laser Therapy may help support healing, reduce pain, and improve tissue mobility as part of a personalised physiotherapy treatment plan.


Book an assessment to find out whether laser therapy could be appropriate for your recovery.


References

[1] Early postoperative treatment of mastectomy scars using a ...  https://www.thieme-connect.com/products/ejournals/pdf/10.5999/aps.2020.02495.pdf

[2] Low-level laser (light) therapy (LLLT) in skin - PMC - NIH  https://pmc.ncbi.nlm.nih.gov/articles/PMC4126803/

[3] The efficacy of low-level laser therapy in oral surgery  http://www.sciencedirect.com/science/article/pii/S1572100025001231

[4] Unlocking the Power of Light on the Skin  https://www.mdpi.com/1422-0067/25/8/4483

[5] Red Light Therapy for Post-Surgery Healing & Scar ...  https://deeplyvitalmedical.com/red-light-therapy-healing-scar-reduction/

[6] Photobiomodulation therapy for enhanced wound and Scar ...  https://link.springer.com/article/10.1007/s10103-025-04587-5

[7] Pelvic Adhesions: Treatment ThroughPelvic Floor Physical ...  https://magiccitypt.com/pelvic-adhesions-treatment-throughpelvic-floor-physical-therapy/

[8] The Effects of Low-Level Laser Therapy on Wound Healing ...  https://pmc.ncbi.nlm.nih.gov/articles/PMC11602420/

[9] Photobiomodulation therapy in keloid management - PMC - NIH  https://pmc.ncbi.nlm.nih.gov/articles/PMC12283276/

[10] The Role of Low Level Laser Therapy in Cancer Recovery  https://oncologyrecovery.com.au/low-level-laser-therapy-in-cancer-recovery/

[11] Photobiomodulation therapy in management of cancer ...  https://www.frontiersin.org/journals/oncology/articles/10.3389/fonc.2022.927685/full

[14] Mechanisms and applications of the anti-inflammatory ...  https://www.aimspress.com/article/doi/10.3934/biophy.2017.3.337

[15] Pulsed high-intensity laser therapy versus low level ... - PMC  https://pmc.ncbi.nlm.nih.gov/articles/PMC8436040/

[17] Physiotherapy Management in Endometriosis  https://www.mdpi.com/1660-4601/19/23/16148

[18] Effect of Pulsed High-Intensity Laser Therapy on Pain ...  https://journals.sagepub.com/doi/10.1089/pho.2017.4419

[19] Transvaginal Photobiomodulation for the Treatment of Chronic ...  https://pmc.ncbi.nlm.nih.gov/articles/PMC8617585/

[20] The Effect of Laser Biostimulation at Sensitized Acupoints on ...  https://pmc.ncbi.nlm.nih.gov/articles/PMC11857755/

[21] Transvaginal Low-level Laser Therapy to Improve Pelvic ...  https://clinicaltrials.gov/study/NCT05540353

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