Avci P. et al. - Photobiomodulation in Dermatology: A Narrative Review

This publication is a narrative review, not a meta-analysis: it compiles and discusses existing research without providing numerical estimates. It describes the proposed cellular mechanisms of cutaneous photobiomodulation and the dermatological areas in which it has been studied.

What This Publication Covers

Photobiomodulation, referred to here as low-level laser therapy, is described as a rapidly growing technology used to stimulate healing, relieve pain and inflammation, and restore function. The authors, affiliated with the Department of Dermatology at Harvard Medical School and the Wellman Center for Photomedicine, apply it to the skin.

This is a journal article, indexed as such in PubMed, and not a systematic review with a meta-analysis. The abstract does not include any sample size, structured literature search, or pooled results. The authors point out a paradox: the skin is the organ most naturally exposed to light, yet it responds to red and near-infrared wavelengths.

Topics Covered

The abstract does not contain any numerical data. Here are the dermatological findings cited by the authors.

• Effects described as beneficial for wrinkles, acne scars, hypertrophic scars, and burn healing.
• Reduction of damage caused by ultraviolet radiation, considered both as a treatment and as a preventive measure.
• Pigmentation disorders, including vitiligo: increased pigmentation through stimulation of melanocyte proliferation, and reduced depigmentation through inhibition of autoimmunity.
• Inflammatory conditions: psoriasis and acne are listed as conditions that can be treated.
• Tolerability: The authors note that the treatment is noninvasive and has almost no adverse effects, leading them to encourage further trials.

How photobiomodulation works for this indication

This is the most thoroughly documented section of the abstract. Photons are absorbed by mitochondrial chromophores in skin cells. The authors then describe changes in electron transport, adenosine triphosphate (ATP)-mediated nitric oxide release, increased blood flow and reactive oxygen species, and the activation of various signaling pathways. Stem cells may also be activated, which would promote tissue repair. These effects are not quantified here.

Limits You Should Know

The key limitation is the format. A narrative review selects the studies it discusses without using a reproducible research method or conducting a formal assessment of the risk of bias. It therefore does not provide information on the magnitude of the effects or the number of patients in whom they were observed.

No specific wavelengths, doses, or treatment protocols are listed in the abstract. The indications listed are supported by varying levels of evidence: wound healing and skin rejuvenation have been studied more extensively than vitiligo or psoriasis. The assertion that there are almost no adverse effects is the authors’ assessment, not the result of systematic monitoring. Finally, this review dates from 2013: more recent randomized trials and meta-analyses in dermatology exist and should be consulted first for any questions regarding efficacy.

What This Means in Practice

This text is useful for understanding the proposed mechanisms and the range of indications explored in dermatology, not for deciding on a treatment. It does not provide any quantified benefits of cutaneous photobiomodulation. The conditions mentioned—psoriasis, acne, vitiligo, burns, and hypertrophic scars—require a dermatologist’s evaluation: the diagnosis determines the course of treatment, and photobiomodulation is not a substitute for any prescribed treatment.

Frequently Asked Questions

Does red light have an effect on the skin even when it is already exposed to it?

This is precisely the point made by the authors: the skin is the organ most exposed to light, and yet it still responds to red and near-infrared wavelengths. The abstract does not quantify this response.

Which skin conditions were studied?

The authors cite wrinkles, acne scars, hypertrophic scars, burn scarring, UV-related damage, vitiligo, psoriasis, and acne. The level of evidence varies depending on the indication, and this review does not provide details on this.

Is there a risk to the skin?

The authors describe a noninvasive approach and an almost complete absence of adverse effects, leading them to encourage further research. This assessment is not based on a systematic review of tolerability. In cases of skin lesions, photosensitivity, or ongoing treatment, medical advice is required.

Reference

Avci P, Gupta A, Sadasivam M, et al. Low-level laser (light) therapy (LLLT) for the skin: stimulating, healing, restoring. Seminars in Cutaneous Medicine and Surgery, 2013. PMID 24049929. View the study on PubMed

This summary is provided for informational purposes only and does not constitute medical advice. Photobiomodulation is not a substitute for prescribed treatment. Consult a healthcare professional.