Laser hair removal doesn’t directly treat scars, but it can meaningfully improve them in certain situations. The clearest benefits come from preventing new scars caused by ingrown hairs and chronic skin conditions, though some of the same laser wavelengths used for hair removal also have a track record of softening and flattening raised scars.
How Laser Hair Removal Prevents New Scars
The most straightforward way laser hair removal helps with scarring is by eliminating the root cause of repeated skin trauma. Conditions like pseudofolliculitis barbae (razor bumps) and hidradenitis suppurativa create a cycle of inflammation, infection, and healing that leaves behind thickened, discolored scar tissue over time. When chronic inflammation persists, it produces both dark spots and fibrotic scarring that worsens with each flare-up.
A study published in JAMA Dermatology found that diode laser hair removal reduced hair density by more than 50% in all subjects and produced greater than 50% improvement in the signs of pseudofolliculitis. Notably, preexisting pigment changes also improved with treatment. The study’s conclusion was blunt: the only definitive cure for pseudofolliculitis barbae is permanent removal of the hair follicles. By destroying those follicles, you stop ingrown hairs from forming, which stops the inflammatory cycle that causes scarring in the first place.
For hidradenitis suppurativa, a chronic condition that causes painful nodules and tunneling scars in areas like the armpits and groin, a meta-analysis of studies using long-pulsed Nd:YAG laser showed significant improvement in disease severity regardless of the specific laser device used. Because hair follicles play a central role in triggering the inflammation behind this condition, destroying them with laser treatment reduces flare-ups and the scarring that follows.
Can the Laser Itself Improve Existing Scars?
This is where it gets more nuanced. Standard laser hair removal targets melanin in the hair follicle, not scar tissue. But the wavelengths used, particularly the 1064 nm Nd:YAG laser, penetrate deep enough into the skin to affect the blood vessels and collagen structures that make scars raised and red. This overlap means that hair removal treatments over scarred areas can sometimes produce modest improvements in scar appearance as a secondary effect.
The 1064 nm Nd:YAG laser is increasingly used to treat keloids and hypertrophic scars specifically because it reaches the deeper layers of the dermis where scar tissue forms. A retrospective study on hypertrophic cesarean-section scars found that combining Nd:YAG laser with steroid tape effectively shortened total treatment time compared to conservative therapy alone. Clinical experience shows that thinner, less inflamed scars on areas like the face and lower leg respond better than thick, highly inflamed keloids on the chest or shoulders.
Dedicated scar revision lasers work differently from hair removal lasers, though. Fractional carbon dioxide lasers, for example, create microscopic columns of damage in scar tissue that trigger the body to rebuild collagen in a more normal pattern. Histology studies show that mature burn scars treated this way shift toward a fetal collagen profile, with more type III collagen (the softer, more flexible kind) replacing the rigid type I collagen that dominates scar tissue. Non-ablative fractional lasers achieve something similar without breaking the skin surface, producing an interwoven collagen structure that more closely resembles normal skin. These are separate procedures from hair removal, but your dermatologist may recommend them if scar improvement is your primary goal.
Dark Marks and Pigment Changes
If your scars are primarily discolored rather than raised, laser treatment has a reasonable track record. A systematic review of post-inflammatory hyperpigmentation treatments found that laser therapy achieved complete resolution in 26% of patients and partial pigment reduction in 66%. Among studies specifically evaluating the 1064 nm Nd:YAG laser (the same wavelength commonly used for hair removal on darker skin), all participants showed significant reduction in dark spots over an average of about six sessions. One study reported that 20% of patients achieved 75% to 100% improvement, while 75% achieved 50% to 74% improvement.
That said, laser treatment can occasionally make pigmentation worse. The same review noted cases of hyperpigmentation flaring after treatment, particularly in darker skin tones. This is a risk with hair removal lasers too, which is why wavelength selection and practitioner experience matter so much when treating skin of color.
Safety Concerns for Scar-Prone Skin
If you’re prone to keloids, laser hair removal requires extra caution. Cleveland Clinic lists a history of keloid scars as a reason to talk with your provider before proceeding, since the laser itself can potentially trigger abnormal scarring in susceptible individuals. Potential side effects of laser hair removal include burns, blisters, and in rare cases, new scars.
Overall, the incidence of adverse effects from laser hair removal is low, and permanent scarring from the procedure itself is very uncommon when performed by trained professionals. A review of adverse effects found that long-term side effects and scarring did not occur in the studies examined. The risk rises with inexperienced operators, incorrect settings for your skin type, or treatment over active skin disease at the site.
There are also situations where laser treatment of any kind should be avoided entirely: if you’ve taken oral retinoids within the past year, if you’re pregnant or breastfeeding, if you’re immunosuppressed, or if you have active skin disease at the treatment site.
What to Realistically Expect
If your scars are caused by repeated ingrown hairs or a condition like hidradenitis suppurativa, laser hair removal is one of the most effective things you can do. It attacks the underlying problem, and the existing scars often fade over time once the cycle of inflammation stops. Preexisting dark marks tend to lighten as the skin heals without constant re-injury.
If you have surgical scars, stretch marks, or other scars unrelated to hair growth, standard laser hair removal won’t do much on its own. The Nd:YAG wavelength has real evidence behind it for flattening hypertrophic scars, but that’s a different treatment protocol with different settings than what’s used for hair removal. You’d need a dermatologist using the laser specifically for scar revision, often in combination with other therapies like steroid injections or silicone sheeting.
For the best results, plan on multiple sessions. Most studies showing meaningful scar or pigment improvement involve four to six treatments spaced weeks apart. Thinner, newer, less inflamed scars consistently respond better than older, thicker ones. And if any redness or firmness remains after treatment, there’s a meaningful chance those scars will recur, particularly with keloids.