IPL is one of the most commonly offered treatments for hyperpigmentation. It is available in dermatology clinics, medical spas, and aesthetic practices. It is usually less expensive than laser, requires less downtime, and is often marketed as a versatile solution for pigmentation, redness, and general skin rejuvenation.
It can work well for certain types of pigmentation on certain skin. But it is frequently recommended in situations where it should not be, particularly for melasma and for darker skin tones. Understanding what IPL actually does, how it differs from laser, and where its limitations are can prevent a treatment that makes pigmentation worse rather than better.
How IPL Works on Pigment
IPL stands for Intense Pulsed Light. Unlike a laser, which emits a single wavelength of light, IPL emits a broad spectrum of wavelengths (typically 500nm to 1200nm) that is then filtered to target a range of chromophores in the skin. Filters can be adjusted to favour melanin absorption, haemoglobin absorption, or a combination of both.
When the broad-spectrum light enters the skin, melanin absorbs part of it. The absorbed energy heats the pigmented cells, damaging them enough that they rise to the surface over the following days and flake off. The surrounding tissue also absorbs some of that energy, which is the fundamental trade-off: IPL is less selective than laser because the light is not concentrated at a single wavelength optimised for one target.
This lower selectivity is what makes IPL versatile (it can treat pigment, redness, and texture in a single session) but also what makes it riskier for pigmentation specifically. The light energy spreads across a wider range of tissue, which means more heat is delivered to areas that do not need treating, including the baseline melanin in the surrounding skin.
IPL vs Laser
The terms are often used interchangeably in marketing, but they describe fundamentally different technologies.
Laser emits a single wavelength in a coherent, focused beam. It can be precisely calibrated for a specific chromophore (melanin, haemoglobin, water) at a specific depth. The energy is concentrated where it needs to be.
IPL emits multiple wavelengths in a broad, non-coherent flash. Filters narrow the range but can't match the precision of a single-wavelength laser. The energy is distributed more diffusely across tissue.
For pigmentation, this difference matters in three specific ways:
- Selectivity. Lasers are better at targeting melanin without heating surrounding tissue. IPL heats a wider area, which increases the inflammatory response.
- Depth control. Lasers can be tuned to reach specific depths precisely. IPL's depth penetration is less controllable because the broad spectrum interacts with tissue at multiple levels simultaneously.
- Skin tone safety. Because IPL is less selective, it interacts more aggressively with baseline epidermal melanin in darker skin tones. Lasers (particularly the 1064nm Nd:YAG) can be configured to bypass epidermal melanin more effectively.
None of this means IPL is a bad technology. It means it is a different tool with a narrower range of appropriate use for pigmentation than its availability might suggest.
| IPL | Laser (e.g. Q-switched) | |
|---|---|---|
| Light source | Broad spectrum (500-1200nm) | Single wavelength |
| Selectivity | Lower, more diffuse | High, targeted |
| Depth control | Less precise | Tunable to specific depths |
| Best for | Superficial sun spots on lighter skin | Wider range of pigment types and depths |
| Skin tone safety | Fitzpatrick I-III only | Broader range (1064nm safest for IV-VI) |
| Melasma risk | High rebound probability | Lower with conservative settings, still cautious |
| Typical cost per session | $200-$600 | $300-$1,500 |
Which Pigment Types and Skin Tones Respond
Dermatologists use the Fitzpatrick scale (I through VI) to classify skin by its response to UV, with higher numbers indicating more melanin and greater pigment reactivity. This classification is particularly important for IPL because the technology has the most significant skin-tone limitations of any pigmentation treatment.
Sun-induced pigmentation on lighter skin is where IPL performs best. Freckles, sun spots, and mild diffuse sun damage on Fitzpatrick I to III skin tend to respond well. The pigment is superficial, the contrast between the spot and surrounding skin is high, and the baseline melanin is low enough that the broad-spectrum light does not cause significant collateral damage.
Post-inflammatory hyperpigmentation (PIH) can sometimes be treated with IPL on lighter skin, but the results are less predictable. PIH indicates the skin has already responded to inflammation with pigment production. Adding heat-based inflammation (which IPL generates more of than laser) creates an inherent tension in the treatment approach.
Melasma is where IPL most frequently causes harm. IPL is commonly offered for melasma because the initial results can look promising. The surface pigment lightens after the first session, and both the patient and the practitioner see improvement. But melasma has a deeper, hormonally driven component that IPL does not address, and the heat and inflammation generated by the treatment can restimulate melanocytes within weeks. The result is a pattern that many people with melasma recognise: initial improvement followed by a return of pigment that is equal to or worse than before. This cycle can repeat through multiple sessions before the pattern is recognised.
Darker skin tones (Fitzpatrick IV to VI) are generally not good candidates for IPL. The skin tone risk notes below explain why in detail, but the short version is that broad-spectrum light cannot adequately distinguish between the target pigment and the baseline melanin in the surrounding skin. Most pigmentation specialists do not recommend IPL for Fitzpatrick IV and above.
Recovery and Downtime
Recovery from IPL is generally mild. Immediately after treatment, the skin may feel warm and slightly flushed, similar to mild sunburn. Treated pigmented spots typically darken within the first 24 to 48 hours (this is expected and indicates the melanin has absorbed the light energy). Over the following 5 to 10 days, the darkened spots crust lightly and flake off.
Most people can return to normal activities the same day or the next day. Makeup can usually be applied after 24 hours. There is no significant peeling, wound healing, or open skin involved unless settings were overly aggressive.
The skin is more photosensitive after IPL. Sun protection is essential for at least 2 weeks after treatment, and ideally maintained consistently throughout the treatment series and beyond. UV exposure during recovery is a common cause of new pigmentation forming in the treated area.
Risk Profile
Who should be cautious or avoid this (for now):
- Anyone with Fitzpatrick IV to VI skin (the risk of burns and PIH is significantly elevated)
- Anyone with melasma (high probability of rebound darkening)
- Anyone with an active tan, recent sun exposure, or recent self-tanner use (self-tanner doesn't affect melanin but can interfere with how some devices read the skin)
- Anyone using photosensitising medications
- Anyone with active skin infections or inflammation in the treatment area
- Anyone who is pregnant (IPL is generally avoided during pregnancy as a precaution)
Skin tone risk notes:
IPL carries the most significant skin-tone limitation of any pigmentation treatment. The broad-spectrum light cannot be tuned to bypass epidermal melanin the way a single-wavelength laser can. For Fitzpatrick IV to VI skin, the risk of burns, blistering, PIH, and hypopigmentation is high enough that most specialists recommend against IPL entirely for pigmentation treatment. This is the procedure where the practitioner's willingness to say "this isn't right for your skin" is most important.
Rebound risk:
Rebound is common with IPL, particularly for melasma. The mechanism is the one described in the melasma section above: initial improvement followed by restimulation. Rebound typically appears 3 to 8 weeks after treatment and is one of the most common reasons melasma patients end up in a worse position than before they started.
Questions to ask your provider:
- What is my Fitzpatrick skin type, and is IPL appropriate for it?
- Has my pigmentation been assessed for melasma? If so, why is IPL being recommended over other options?
- What filters and energy settings will you use?
- What is the realistic risk of post-inflammatory hyperpigmentation with this protocol on my skin?
- What is your contingency plan if the pigment comes back darker after treatment?
Best paired with:
For the skin types and pigment conditions where IPL is appropriate, results are best maintained with a consistent protection and prevention routine. Sun exposure between sessions and after completing the series is the most common reason results fade. Topical brightening actives (vitamin C, niacinamide, tranexamic acid) can complement IPL results but should be reintroduced gradually after the skin has healed from each session.
IPL delivers broad-spectrum light energy across a wide treatment area, which means the skin's inflammatory response is distributed rather than concentrated. How the skin manages that distributed thermal load depends partly on its systemic condition. Elevated oxidative stress reduces the skin's capacity to process thermal injury cleanly. Low antioxidant reserves and micronutrient gaps slow the repair processes that determine whether the treated area heals evenly or develops post-inflammatory pigmentation. For the narrow window of skin types and pigment conditions where IPL is appropriate, supporting those internal conditions improves the odds that the skin handles the treatment as intended. Internal support covers the practical side.
The Takeaway
IPL has a role in pigmentation treatment, but it's a narrower role than its availability suggests. For superficial sun damage on lighter skin, it's accessible, effective, and relatively low-risk. Outside of that window, the risks increase quickly.
The most important thing to know about IPL is when it's not the right choice. For melasma, for darker skin tones, and for pigmentation with an inflammatory or hormonal component, other options carry less risk and produce more reliable results. Knowing that before the consultation is worth more than anything the consultation itself will tell you.
