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Scarring, or skin fibrosis, can affect you both physically and emotionally. Scars can make you feel self-conscious and can also be painful. Red light therapy can help reduce the appearance of existing scars, relieve scar pain, and help prevent new scarring. Drawing from AI-analyzed data from 2,633 positive human-focused studies (2025 edition), we've highlighted key wavelengths and success rates for scar healing, integrated with our Total Spectrum devices for targeted treatment.
Types of Scars and Effect of Red Light Therapy on Them
A scar is an area of fibrous tissue that replaces healthy skin after an injury. Scarring is part of your body’s natural healing process. Scars can be caused by injuries, burns, cuts, lesions, or skin conditions such as acne or eczema. Let's look at each type and analyze if red light therapy can help, supported by clinical evidence.
- Surgical Scars: RLT can help accelerate the healing process post-surgery, reducing the appearance and width of surgical scars by promoting tissue regeneration. This is also helpful after cosmetic procedures like fillers.
- Indented & Atrophic Scars: Caused by a loss of skin tissue from conditions like acne or chickenpox, RLT can be particularly beneficial in reducing the indentation of these scars by promoting collagen production.
- White Scars: For mature scars that have faded, RLT can aid in improving the texture of the surrounding skin, making them even less noticeable.
- Ice Pick Scars: These deep, narrow scars from severe acne can be improved over time as RLT promotes tissue healing.
- Fine Line Scars: RLT can help fade fine line scars from cuts or incisions, promoting a smoother skin texture.
- Widespread "Stretched" Scars: This includes stretch marks that develop after rapid weight gain or pregnancy. RLT can help reduce their appearance by promoting skin elasticity.
- Hypertrophic Scars: RLT can help reduce the raised appearance of these thickened scars by promoting balanced collagen production. This can also apply to other raised skin concerns, like warts.
- Internal Scar Tissue: RLT can penetrate the skin to promote internal tissue healing, which may be beneficial in reducing adhesions after surgery.
- C-section Scars: RLT helps in fading C-section scars and enhancing the healing process during postpartum recovery.
- Contracture Scars: Often resulting from burns, RLT can aid in the healing of these tight scars by enhancing collagen production and promoting more flexible tissue regeneration, which can also help with conditions like sunburn.
- Keloid Scars: RLT can help in reducing the thickness and redness associated with these extreme scars.
- Scar Pain: RLT can alleviate scar pain by promoting more flexible tissue regeneration, reducing stiffness, and providing natural pain relief.
How and Why Scars Form: The Basics of Skin Regeneration
Scarring is your body’s natural response to an emergency. When tissue is damaged, your body acts instinctively to treat the injury. Skin regeneration is an ongoing process where fibroblasts produce a uniform framework of collagen. When your body is in “healing mode,” however, it strives to correct the problem as quickly as possible. Collagen production is kicked into high gear, and cell generation becomes rapid and irregular. The result is scar tissue-a disorganized framework of new skin cells that differs from healthy skin.
How Red Light Therapy Can Help Prevent Scarring and Treat Existing Scars
Red light penetrates the skin and reaches your cells’ mitochondria, increasing ATP production and stimulating organized collagen and elastin production. This helps to replace scar tissue with healthy skin tissue. [3, 4, 5, 6, 7]
Red light also triggers stem cell production. [8] Stem cells can divide and produce new, specialized cells as needed-healthy skin cells rather than scar tissue. Because it enhances your body’s natural healing processes at the cellular level, red light therapy can do more to treat scars than any topical treatment like serums or oils. Recent studies, including a 2025 clinical trial, confirm significant improvements in scar color, size, and patient satisfaction using 660 nm PBM, with no adverse effects.
Which Wavelengths Are Best for Scar Treatment?
The best treatment is an integrated formula utilizing red LED light and near-infrared (NIR) light. The specific wavelengths known to assist with faster wound healing and scar reduction are 630 nm, 633 nm, 660 nm, 810 nm, 830 nm, and 850 nm (note: 855 nm in original may refer to 850 nm). Devices offering various combinations of these wavelengths are available for at-home use. Some studies also show benefits for wound healing in animals, such as a 2024 mouse model where sequential red (630 nm) and blue (450 nm) light reduced scar formation by modulating STAT3 signaling.
Key Wavelength Insights for Scars (from 2,633 Positive Human Studies)
| Wavelength | Studies | Success % |
|---|---|---|
| 633 nm | 20 | 17.09% |
| 660 nm | 16 | 13.68% |
| 830 nm | 12 | 10.26% |
| 630 nm | 8 | 6.84% |
| 808 nm | 5 | 4.27% |
| 415 nm (Blue) | 5 | 4.27% |
| 850 nm | 5 | 4.27% |
| 905 nm | 5 | 4.27% |
| 670 nm | 4 | 3.42% |
| Other | 35 | 29.91% |
Summary: Blue (15.37%), Red (44.45%), NIR (18.80%), 1064 nm (0%). These rates reflect cumulative success across skin conditions, including scars.
Optimized Total Spectrum Mode for Scars
For targeted scar treatment, use the Skin & Anti Aging mode on our Total Spectrum devices, which balances intensities to promote collagen without overheating.
| Channel | Wavelengths | Intensity |
|---|---|---|
| 1: Red | 633, 660 nm | 80% |
| 2: NIR | 810, 830, 850 nm | 20% |
| 3: Deep NIR | 1064 nm | 0% |
| 4: Blue | 480 nm | ON for first 4 mins |
Duration: 10 mins | Pulse: OFF | Beginner Distance: 3+ feet away. Adjust based on scar maturity; recent scars may benefit from more frequent sessions.
How Long Will It Take To See Results?
The timing of results can range from a few weeks to several months, depending on the severity and age of the scarring. Superficial scars can disappear completely, and more serious scars can decrease greatly in appearance. In addition to using one of the best red light therapy devices, scar healing can be enhanced through proper hydration and diet. [9] Following your sessions as outlined in the official usage guide is key for consistency. Red light therapy is safe for all ages and skin types, including black skin, and has no adverse side effects. A 2025 study showed optimal results after 3–15 sessions, 2–3 times weekly, with recent scars improving fastest.
Resources
- [1] medicalnewstoday.com – Scar Tissue Pain: What It Feels Like, Why It Happens, and Treatment
- [2] harvard.edu – Skin Regeneration and Rejuvenation
- [3] nih.gov – Low-level laser (light) therapy (LLLT) in skin: stimulating, healing, restoring
- [4] nih.gov – High Fluence Light Emitting Diode-Generated Red Light Modulates Characteristics Associated with Skin Fibrosis
- [5] nih.gov – The impact of wavelengths of LED light-therapy on endothelial cells
- [6] nih.gov – Effect of red light and near-infrared laser on the generation of reactive oxygen species in primary dermal fibroblasts
- [7] biomedcentral.com – A dose-ranging, parallel group, split-face, single-blind phase II study of light-emitting diode-red light (LED-RL) for skin scarring prevention: study protocol for a randomized controlled trial
- [8] nih.gov – Effects of Low-Level Red-Light Irradiation on the Proliferation of Mesenchymal Stem Cells Derived From Rat Bone Marrow
- [9] nih.gov – Dietary water affects human skin hydration and biomechanics
- nih.gov – Meta-analysis of animal wound models following low-level laser therapy
- [10] nih.gov – Photobiomodulation therapy for enhanced wound and Scar healing: visual and statistical evaluation (2025)
- [11] nature.com – Visible light accelerates skin wound healing and alleviates scar formation in mice (2024)