Red Light for Surgical Wound Healing: Evidence, Timing and Safety

Can red or near-infrared light improve surgical wound healing?

A 2026 systematic review and meta-analysis of near-infrared light after surgery found statistically favorable pooled effects for wound healing and postoperative pain. The review included 56 trials in the systematic review and 35 in meta-analysis, but heterogeneity was high and overall certainty of evidence was rated very low.

That combination—promising signal, low certainty—is exactly why this topic needs careful wording.

Which wavelengths look most promising?

The review’s moderator analyses suggested better outcomes with shorter near-infrared wavelengths in roughly the 700–850 nm range, along with several treatment-session and application characteristics. That does not establish a universal home protocol.

Surgical studies differ in procedure, anatomical site, contact technique, fluence, timing and number of sessions. A panel emitting 810 or 850 nm is not automatically equivalent to a study protocol.

What outcomes are measured?

Postoperative PBM studies may assess:

epithelialization and wound closure;
wound-healing scales;
postoperative pain;
swelling;
scar appearance;
inflammatory markers.

The 2026 review found more consistent signals for healing and pain than for swelling, scarring or inflammatory outcomes.

Surgeon instructions come first

A fresh incision may have dressings, adhesives, sutures, drains or activity restrictions. The operating team also knows whether there are reasons to avoid heat, moisture, manipulation or unapproved devices near the wound.

Do not remove dressings, expose an incision or change wound care simply to use PBM.

When not to experiment with home light therapy

Contact the surgical team for increasing redness, warmth, swelling, drainage, wound separation, fever, severe worsening pain, bleeding or other signs of complication.

A postoperative infection, hematoma, seroma or dehiscence needs diagnosis and treatment—not a higher light dose.

Is PBM useful for scars?

Scar appearance is a separate outcome from uncomplicated wound closure. Evidence for scar quality is less consistent than the pooled wound-healing signal, and different scar types—hypertrophic scars, keloids, atrophic scars—should not be grouped together.

What to look for in a clinical PBM protocol

A credible protocol should specify wavelength, irradiance or power density, energy density, distance, application technique, treatment timing, session number and the type of surgery studied.

For wound-type comparisons, see Diabetic Foot Ulcers, Pressure Injuries, Venous Leg Ulcers and Burn Wounds. Return to Red Light Therapy by Condition.