Treating acne with red light therapy: does it really work?
Acne vulgaris is one of the most common skin conditions worldwide. It primarily affects teenagers and young adults, but acne also occurs frequently in adulthood. The condition is caused by inflamed sebaceous glands and is exacerbated by excessive sebum production, bacterial overgrowth ( Cutibacterium acnes ), and hormonal fluctuations.
Although countless treatments are available – from antibiotics to isotretinoin – more and more people are seeking natural, skin-friendly, and non-invasive solutions . One of these is red light therapy, a form of photobiomodulation.
What is red light therapy?
Red light therapy (RLT) uses light in the range of 630 to 660 nanometers. These wavelengths are in the visible spectrum and can penetrate the skin to a depth of a few millimeters. Red light is absorbed by skin cells and stimulates mitochondria to produce more ATP (energy).
For acne, this is important because red light:
- Inhibits inflammation in the skin
- Sebum production stabilizes
- Skin healing accelerates
- Promotes collagen production (for scar healing)
When red light is combined with blue light (460 nm) , a powerful synergistic effect is created: blue light acts antibacterially against C. acnes , while red light reduces inflammatory responses and supports healing.
What happens in the skin when exposed to red light?
| Biological process | Explanation |
|---|---|
| ATP production | The light stimulates the mitochondria, allowing cells to repair faster and inflamed skin layers to renew more quickly. |
| Anti-inflammatory | By inhibiting pro-inflammatory cytokines such as IL-6 and TNF-α, redness, swelling, and pain are reduced. |
| Sebaceous gland regulation | Red light reduces the excessive activity of sebaceous glands, which reduces the chance of clogged pores and pimples. |
| Wound healing and scar repair | Collagen synthesis is stimulated, which is important for healing existing pimples and fading acne scars. |
Effective wavelengths for acne
Research shows that the combination of two wavelengths is the most effective:
-
Blue light (415 nm): Bactericidal against Cutibacterium acnes
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Red light (630–660 nm): Reduces inflammation and stimulates healing
Using only red light can also be effective, especially for inflammation-prone acne or for people with sensitive skin who tolerate blue light less well.
Scientific substantiation
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A. Koning et al. – Photodynamic therapy for moderate and severe acne vulgaris.
This study describes how red light in combination with a photosensitizer (5-ALA) leads to a significant reduction in acne in subjects. -
Razoki & Brinkhuizen. (NVDV). Lasers in dermatology.
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This publication shows that red light therapy calms the sebaceous glands and significantly reduces the inflammatory response in acne. -
Bispo, MAF – Fighting infections with light (University of Groningen)
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The author describes how red and blue light have an antimicrobial effect and can fight infections, including acne-related bacteria.
Application and treatment advice
| Element | Recommendation |
|---|---|
| Treatment duration | 10 to 20 minutes per session |
| Frequency | 3 to 5 times a week, for at least 6 weeks |
| Recommended devices | LED masks or panels (home use) or professional light therapy in a clinic |
| Wavelengths | 630–660 nm (red light), possibly combined with 460 nm (blue light) |
Please note: although red light is safe, people with photosensitive skin conditions or users of certain medications (such as isotretinoin) should consult a doctor.
Conclusion
Red light therapy is a safe and effective method to treat acne vulgaris , especially for people seeking natural alternatives to medication. By suppressing inflammation, regulating sebum production, and allowing the skin to recover faster, red light is a valuable addition to existing treatment strategies.
Moreover, it works well in combination with blue light, which targets the bacterial component of acne. Whether you choose a clinic treatment or a home device, red light therapy offers a powerful, painless solution with minimal risks.
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