Yes, IPL (intense pulsed light) can cause hyperpigmentation, and it’s one of the more common side effects of the procedure. In one randomized controlled trial of patients with skin types II through IV, 60% developed hyperpigmentation after treatment. The risk rises significantly with darker skin tones and higher energy settings, but even lighter-skinned individuals aren’t immune. The good news: IPL-induced darkening is almost always temporary, typically beginning to fade within one to two weeks.
How IPL Triggers Darkening
IPL works by delivering broad-spectrum light energy into the skin, where it’s absorbed by pigmented targets like melanin and hemoglobin. The goal is selective thermal damage to things like sun spots, broken capillaries, or hair follicles. But when the energy is too intense, hits skin that’s already rich in melanin, or causes more inflammation than intended, the skin’s pigment-producing cells can go into overdrive. This post-inflammatory response deposits excess melanin in the treated area, leaving behind darker patches.
Ironically, when IPL is calibrated correctly, it actually reduces pigment production. Research on human skin cells shows that appropriately dosed IPL suppresses the key enzyme responsible for melanin synthesis and lowers the expression of multiple pigment-related proteins. The problem isn’t IPL itself. It’s the margin between a therapeutic dose and one that causes collateral damage, and that margin gets narrower depending on your skin.
Who’s Most at Risk
Skin tone is the single biggest predictor. Dermatologists classify skin on the Fitzpatrick scale from I (very fair, always burns) to VI (deeply pigmented, never burns). IPL is generally considered safe for types I through III, while types IV through VI carry substantially higher risk. The reason is straightforward: darker skin contains more melanin throughout the epidermis, and that melanin competes with the intended target for light absorption. The device can’t fully distinguish between the melanin in a sun spot and the melanin in your surrounding skin, so more of the energy gets absorbed where it shouldn’t be.
A large clinical series of over 2,500 women undergoing IPL hair removal confirmed this pattern. Patients with Fitzpatrick types IV and V experienced significantly higher rates of pigmentary changes and epidermal injury compared to lighter skin types. The correlation between darker skin and burning complications was statistically significant. Even within the type II to IV range, the randomized trial mentioned above found that darker pigmentation was strongly correlated with more severe side effects overall.
Recent tanning matters just as much as your baseline skin tone. A fresh tan temporarily increases the melanin in your outer skin layer, effectively mimicking a darker Fitzpatrick type and raising your risk even if you’re normally a type II or III.
Device Settings and Operator Skill
The other major variable is the person holding the device. Higher fluence (the amount of energy delivered per pulse) and longer pulse durations both increase the likelihood of adverse events. When an untrained provider selects inappropriate settings or delivers too much energy, the result is nonspecific thermal damage to the epidermis rather than targeted treatment. Thinner skin areas like the neck and chest are particularly vulnerable.
This is why professional oversight matters. The American Society for Dermatologic Surgery recommends that energy-based procedures like IPL be performed or directly supervised by a physician, ideally a board-certified dermatologist. Med spas and clinics vary widely in training standards, and operator inexperience is a well-documented contributor to IPL complications.
Medications That Raise Your Risk
Certain drugs make your skin more reactive to light energy, increasing the chance of burns and subsequent darkening. Two that deserve specific mention: amiodarone (a heart rhythm medication) carries a known risk of both photosensitivity and hyperpigmentation with light-based treatments, and minocycline (an antibiotic commonly prescribed for acne) can independently cause skin darkening and should be stopped at least four weeks before IPL.
Other photosensitizing medications, including some antibiotics and anti-inflammatory drugs, can also increase your risk. The general recommendation is to discontinue antibiotics two to three weeks before treatment and to discuss any current medications with your provider before booking a session. Retinol products should be stopped five to seven days prior.
Pre-Treatment Steps That Lower the Risk
Most IPL-related hyperpigmentation is preventable with proper preparation. The most critical step is sun avoidance for at least two weeks before your appointment. You should not be treated with a sunburn, a fresh tan, or any sunless tanning product on your skin. Discontinue self-tanners at least two weeks ahead of time.
Your provider should assess your Fitzpatrick skin type and adjust device settings accordingly, starting with lower fluence and working up cautiously. A test patch on a small area before full treatment can reveal how your skin responds. If you have naturally darker skin (type IV or above), you may want to explore alternative treatments that carry less pigmentation risk, something a dermatologist can help you evaluate.
What Recovery Looks Like
If you do develop darkening after IPL, the timeline is generally reassuring. Treated areas often look darker immediately after the procedure, and this is sometimes a normal part of the process, particularly with pigmented lesions like sun spots that are being targeted. These darkened spots typically begin fading within 7 to 14 days as the damaged pigment rises to the surface and flakes away.
Post-inflammatory hyperpigmentation that extends beyond this window, appearing as broader patches of darkening rather than targeted spots, can take longer to resolve. Most cases clear within a few weeks to a few months, especially with proper aftercare. During recovery, gentle cleansers and moisturizers are recommended, along with diligent sunscreen use (SPF 30 or higher) to prevent UV exposure from worsening the discoloration. Sun exposure on freshly treated skin is the fastest way to turn temporary darkening into a persistent problem.
For stubborn hyperpigmentation, a dermatologist may recommend topical treatments that suppress melanin production or speed cell turnover. A series of IPL sessions spaced about a month apart, with settings adjusted based on your skin’s response, typically produces the best overall results over three to six months.