Can Red Light Therapy Help Scars Heal After Surgery?

Short answer: yes, early research suggests red and near-infrared light can support smoother, flatter healing after a surgical scar forms — though it works best as an add-on to good wound care, not a replacement for it. If you're a few weeks past a C-section, knee replacement, appendectomy, or any other incision and wondering whether it's worth shining a light on it, here's what the evidence actually shows, and how to do it safely.

Quick shop: if you're treating a single incision line, our handheld device (dual 660nm/850nm LEDs) is built for exactly this kind of targeted, spot treatment. Not sure what fits your situation? Try the device finder quiz.

What is red light therapy for scars, exactly?

Red light therapy, also called photobiomodulation, uses specific wavelengths of red (around 630-660nm) and near-infrared (around 810-850nm) light to reach skin cells and the tissue just beneath the surface. Unlike a laser used in-office for resurfacing, at-home red light devices don't cut, ablate, or heat tissue. They're a low-level light exposure that some research links to changes in how fibroblasts (the cells that lay down collagen) behave during healing.

Does research support using it on surgical scars?

Some of the more convincing evidence for red light therapy anywhere in the wellness space comes from scar and wound studies. A 2021 split-face randomized controlled trial in the Journal of Biophotonics tested 633nm LED red light on post-surgical facelift scars, starting about a week after surgery and continuing three times a week for three weeks, comparing treated skin to the untreated side on the same patient (Kurtti et al., Journal of Biophotonics, 2021). A broader scoping review of clinical trials on red and near-infrared photobiomodulation for burn, hypertrophic, and post-surgical scars, published in Lasers in Medical Science, found a consistent pattern of benefit across different surgical settings, including general surgery and reconstructive procedures, though researchers note that study designs and dosing still vary a lot from trial to trial (Lasers in Medical Science, scoping review).

A separate line of research on low-level laser therapy and scar tissue, indexed on PubMed, points to similar mechanisms: better-organized collagen and improved scar appearance in some studies, with the caveat that results aren't uniform across every scar type or skin tone studied (PubMed, efficacy of low-level laser therapy on scar tissue). In plain terms: this isn't a fringe idea. It's an active area of surgical and dermatology research, but it's still developing, and no study claims it erases a scar completely.

When after surgery should you start?

Short answer: not until your surgeon clears the incision as closed and healing normally, which is often around two to four weeks post-op but varies a lot by procedure. Several of the clinical protocols referenced above began LED treatment roughly one week after surgery, but that was under close medical supervision with a fully closed incision. At home, it's safer to wait until there's no open wound, no drainage, no stitches or staples still in place, and your surgeon has given the go-ahead. Using light therapy on an open or actively healing wound without guidance isn't something we'd recommend.

How do you actually use it on a scar?

Once you're cleared, the routine research trials often used is a short session, a few times a week, held close to the scar itself. For a single incision line — a C-section scar, a knee or hip surgery scar, an appendectomy scar — a handheld device lets you hold the dual 660nm/850nm light directly against the area for a few minutes at a time. If you're dealing with a longer incision or multiple scars, such as after a larger orthopedic surgery, a panel like the FX300 can cover more surface area in one session. Clean, dry skin, consistent short sessions, and patience over weeks to months (not days) are the common thread across the research.

Is it safe to use on new scars?

Short answer: generally yes on a fully closed, surgeon-cleared scar, but a few situations call for extra caution. Skip it over any area that's still open, infected, or oozing. If you're prone to keloid scarring, check with your dermatologist first, since some keloid protocols pair light therapy with other treatments like corticosteroid injections rather than using it alone. And if you're on a photosensitizing medication or have a condition that makes your skin unusually light-sensitive, ask your provider before starting.

Frequently asked questions

Can red light therapy remove a scar completely?

No. Research shows it may help scars look flatter, softer, and less red or raised over time, but no study shows it eliminating a scar. Think of it as support for the healing process, not an eraser.

How soon after surgery can I start using red light therapy?

Only after your surgeon confirms the incision is fully closed and healing well, which is commonly a few weeks out but depends entirely on your specific procedure. Always get that go-ahead first.

How long until I'd see a difference?

Clinical trials that showed benefit generally ran treatment for several weeks and measured results at one, three, and six months or later. Scar remodeling is a slow biological process, so consistency over months matters more than any single session.

Can I use it on a keloid or raised scar?

Talk to your dermatologist first. Some research on keloids combines photobiomodulation with other in-office treatments rather than using light alone, so it's worth getting guidance specific to your scar type.

Is a handheld device or a panel better for scars?

For one incision line, a handheld device gives you precise, close-contact coverage. For a longer scar or several treatment areas, a panel like the FX300 covers more ground per session.

Is this FSA or HSA eligible?

Yes, AWA's red light therapy devices are FSA/HSA eligible. See our FSA/HSA guide for exactly how to pay with pre-tax dollars.

The bottom line

If you're past the surgical follow-up window and cleared to care for your scar at home, red and near-infrared light therapy is a reasonable, low-risk tool to add to your routine, backed by a growing body of clinical research, not just marketing claims. It's not a substitute for your surgeon's aftercare instructions, and it won't work overnight. Not sure which device fits your situation? Take our device finder quiz or browse the full handheld collection.

Lights on, pain off.

This article is for general education and is not medical advice. Red light therapy devices are intended for general wellness and are not intended to diagnose, treat, cure, or prevent any disease. Always check with a qualified healthcare provider before starting a new therapy.