IPL (intense pulsed light) is not dangerous for most people when used correctly, but it does carry real risks that range from temporary redness to, in rare cases, burns and scarring. Over 25 years of clinical use have not revealed any long-term safety concerns like cancer risk, and the most common side effects resolve on their own within hours or days. The people most likely to experience serious complications are those with darker skin tones, those taking certain medications, or those treated by someone without proper training.
How IPL Works on Your Skin
IPL devices emit broad-spectrum light that passes through your skin and gets absorbed by specific pigments: melanin (the pigment in hair and skin), hemoglobin (the red pigment in blood vessels), and water. When these pigments absorb the light, they heat up rapidly and are destroyed through a process called selective photothermolysis. That’s how IPL removes unwanted hair, fades dark spots, and reduces visible blood vessels. The light is selective enough to target these pigments without heating the surrounding tissue to the same degree, which is why most people tolerate it well.
Common Side Effects
The most frequent reactions to IPL are mild and temporary. In a postmarketing surveillance study of 1,692 reports from home-use IPL devices, the three most common complaints were skin pain (27.8%), thermal burns (18.7%), and redness (16.0%). In clinical settings, nearly every study reports some degree of redness immediately after treatment, but it typically fades within hours.
Other common reactions include mild swelling around treated hair follicles, light crusting, and temporary skin sensitivity. Multiple clinical studies of home IPL devices found that the discomfort was tolerable for nearly all participants, and one study comparing an at-home IPL device to hot wax found the IPL actually caused less irritation, including less redness, flaking, and swelling over the 245-day study period.
When Serious Complications Happen
Burns, blistering, and pigment changes are the most significant risks. In one clinical review, adverse reactions included redness in 87% of patients, darkening of the skin in 60%, blisters in 20%, lightening of the skin in 20%, and crusting in 13%. These numbers come from patients who had already experienced problems, so they don’t reflect the average person’s experience, but they show the range of what can go wrong.
Scarring is the most feared complication. A study by Hammes et al. evaluated 43 patients who developed complications after IPL and laser treatments performed by non-physicians without proper medical oversight. In that group, 81.4% had pigment changes, 25.6% had scarring, and 14% had texture changes in the skin. The common thread in severe cases is almost always improper settings, inadequate training, or treatment of the wrong skin type.
The good news is that even serious complications often improve significantly. One case report of a patient who developed second-degree burns after IPL showed marked improvement after four months, with only minimal residual darkening and no raised scarring.
Why Darker Skin Tones Face Higher Risk
IPL targets melanin, and darker skin contains more of it. This means the light energy meant for a hair follicle or a dark spot can also be absorbed by the surrounding skin, causing burns, blisters, or lasting pigment changes. People with medium to dark skin tones (Fitzpatrick skin types IV through VI) are at substantially higher risk for these complications. The case report of second-degree burns mentioned above involved a patient with type IV skin, a medium-brown complexion.
Most professional-grade IPL devices can be adjusted to lower energy settings for darker skin, but the margin for error shrinks considerably. Many at-home devices include built-in skin tone sensors that prevent the device from firing on skin that’s too dark, which reduces but doesn’t eliminate the risk. If you have a darker complexion, IPL may not be the safest hair removal or skin treatment option for you, and a consultation with a dermatologist before treatment is worth the time.
Home Devices vs. Professional Machines
At-home IPL devices are designed to be safer through lower power. A widely studied home device, the Silk’n, operates at a maximum energy density of 5 joules per square centimeter, which is significantly less than what professional machines deliver. The device also has physical safety features: it can only fire when the entire treatment tip is in direct contact with the skin surface, preventing accidental flashes into the air or toward the eyes.
Home IPL devices sold in the U.S. go through FDA clearance, which requires compliance with electrical safety standards, electromagnetic compatibility testing, and biological evaluation for skin irritation and cytotoxicity. That said, FDA clearance means the device is substantially equivalent to an already-marketed device. It doesn’t mean the FDA tested it on your specific skin type or condition. Lower power reduces risk but also reduces effectiveness, so home treatments typically require more sessions over a longer period.
Eye Injury Risks
IPL light can cause serious eye damage, including corneal burns and, in extreme cases, blindness. This is especially relevant for wavelengths in the 755 to 1,064 nanometer range, which penetrate deeper and account for the majority of reported ocular injuries from light-based devices. Multiple case reports document injuries from patients or staff removing protective eyewear during a procedure.
If you’re using a home device on your face (for upper lip hair, for example), never flash the device near your eyes, even with them closed. Professional treatments near the eye area should always involve opaque protective goggles or corneal shields. Sunglasses are not sufficient.
Medications and Conditions That Increase Risk
Several medications make your skin more sensitive to light and raise the chance of burns during IPL treatment. Isotretinoin (commonly known by the former brand name Accutane) is the biggest concern. If you’ve taken it within the past year, IPL is generally contraindicated because the drug thins the skin and impairs healing. Other substances that increase photosensitivity include St. John’s Wort, Ginkgo Biloba, and certain essential oils used in aromatherapy.
Blood thinners and aspirin can increase bruising and should be disclosed before treatment. IPL is also contraindicated during pregnancy, for people with epilepsy, for those with metal or electronic implants in the face, and for people with irregular heartbeats or active blood clot conditions.
Long-Term Safety and Cancer Risk
One of the most common concerns is whether repeated IPL treatments could cause skin cancer. After more than 25 years of clinical use and research, there is no evidence that IPL increases cancer risk. A comprehensive literature review focusing on DNA damage, oxidative stress, and cumulative adverse events found no indication that repeated IPL exposure leads to long-term risks. One study cited in that review involved 52 treatments over six months and found no increased tumor formation or carcinogenicity. IPL operates at wavelengths that do not interact with melanoma cells in a way that would promote their growth, and typical device settings lack the photochemical energy needed to damage DNA the way ultraviolet radiation does.