The Acne Guide
Acne on darker skin. Why the wavelength you're treated with matters.
Acne treatment for Fitzpatrick IV-VI skin is not a smaller version of the standard protocol. Melanin absorbs many of the same wavelengths lasers use to treat acne, which is why device choice and calibration matter more, not less, on deeper skin tones. Long-wavelength Nd:YAG is favoured because it reaches its target without being scattered by surface pigment first.
If you have been told your skin is "too risky" for laser, or that lasers "aren't really made" for tones like yours, you are not imagining a pattern. You are describing a real one. Much of the acne research the industry works from was built on fair skin, and a lot of the caution you've absorbed is a rough, blunt-instrument response to a genuine problem rather than a considered answer to it.
The genuine problem is this: melanin competes with almost every chromophore a laser is built to target. On deeper skin tones there is simply more of it, spread more actively, so a device tuned for lighter skin can find pigment instead of its intended target and cause the very mark it was meant to prevent. That is a real risk. It is also a solvable one, and it has been solved with a specific, well-understood piece of physics: wavelength selection.
This article explains that physics in plain terms, what it means for choosing a device, and why the protocol still has to be set by a clinician who has actually looked at your skin, not by a default dial setting built for someone else's.
Why does melanin change the equation for laser treatment?
Every laser targets a chromophore, a structure in the skin that absorbs a particular wavelength of light and converts it to heat. For active acne, the target is the inflammatory and sebaceous component beneath the surface. But melanin is also a chromophore, and it absorbs a broad range of the visible and near-infrared spectrum. On Fitzpatrick I-III skin, there is comparatively little of it competing for that light. On Fitzpatrick IV-VI skin, epidermal melanin is denser and more reactive, so it absorbs a meaningful share of the energy before the beam can reach the layer the treatment is actually aimed at.
Two things follow from this. First, more of the laser's energy is spent on the surface than intended, which can produce more heat in the epidermis than the treatment plan called for. Second, and this is the part that matters most for acne specifically, an already-inflamed area is more melanin-reactive than calm skin. Treat it with the wrong wavelength, at the wrong setting, and the skin's own pigment-producing cells can over-respond, leaving a mark that outlasts the blemish it replaced.
This is not a reason to avoid treatment. It is a reason to be precise about which wavelength does the job with the least melanin interference.
Why is long-wavelength Nd:YAG the safer choice for deeper tones?
The 1064nm Nd:YAG wavelength falls at the long end of the spectrum lasers use for skin treatment. At that wavelength, melanin absorption drops considerably compared with shorter wavelengths, while the laser's ability to reach deeper structures, the ones actually responsible for active acne, stays effective. In practical terms, the light passes through the epidermis with comparatively little scatter or absorption from surface pigment, then reaches the depth where the sebaceous and inflammatory component lies.
This is the mechanism, not a marketing description of it: a longer wavelength is less likely to be intercepted by epidermal melanin on its way to the target, which is what makes it the better-suited option for Fitzpatrick IV-VI skin. Shorter wavelengths and broad-spectrum light sources have a rougher history here, precisely because they are absorbed strongly by melanin near the surface, which is where the risk of an unwanted pigment response begins.
At Pink, active acne on deeper skin tones is treated with a long-pulsed Nd:YAG dual-step protocol for this reason. The wavelength does the physics; the calibration does the rest.
Does the protocol change for my skin tone, and who decides that?
Yes, and this is the part that gets skipped when people talk about "safe lasers" as though the device alone settles the question. A device that is well suited to darker skin can still be used badly. The single most common way that happens is applying the settings built for Fitzpatrick I-III skin to Fitzpatrick IV-VI skin without adjustment, because the operator either hasn't checked or doesn't know how to check.
Published safety data on laser complications consistently point to the same conclusion: a meaningful share of adverse outcomes trace back to operator error rather than device limitation, and using a lighter-skin default setting on darker skin is the single most cited version of that error. This is why the wavelength is only half the story. The other half is a clinician who has actually assessed your Fitzpatrick type in person, at consultation, and calibrated the protocol to it specifically, rather than running one setting across every patient in the chair that day.
This is non-negotiable at Pink. Every active acne protocol is calibrated to your Fitzpatrick type and your skin's current state at consultation, not assumed from a chart. If a clinic can't tell you how their settings change for darker skin, that is the question worth asking before you book anything.
What about the marks left behind after a breakout?
Post-inflammatory hyperpigmentation, the flat brown or tan marks that linger after a blemish has healed, is a common sequela of acne on darker skin and is often more bothersome to patients than the acne itself, but it's a pigment concern rather than an active-acne one, and Pink's Face & Body Skin Lightening & Brightening programme is the better starting point if that's your main concern.
Frequently Asked Questions
Is laser treatment actually safe for Fitzpatrick V and VI skin, not just IV?
Fitzpatrick V and VI skin can be treated safely with the right wavelength and a protocol calibrated specifically to that skin type. Long-wavelength Nd:YAG is favoured across this range precisely because its reduced melanin absorption holds at the darkest end of the scale, not just the lighter end of "darker skin." The calibration, not the Fitzpatrick number alone, is what determines the outcome.
Why have I been told no by other clinics before?
Many clinics default to caution because a wavelength that suits fair skin genuinely is riskier on deeper tones, and rather than adjusting the device or the protocol, some simply decline to treat. That caution is understandable given the history, but it isn't the only answer. The right wavelength, chosen and calibrated for your specific skin type, changes the risk profile substantially.
Will treatment make my skin darker or leave new marks?
Any energy-based treatment carries some risk of a pigment response on darker skin, which is exactly why wavelength selection and calibration matter as much as they do. Choosing a long wavelength that bypasses epidermal melanin, and setting the protocol to your Fitzpatrick type at consultation, is how that risk is managed down. Your clinician will talk you through your specific risk profile before any treatment begins.
Do I need a dermatologist referral to start?
No. Active acne treatment with laser is available directly through consultation, without a referral. If a presentation looks like it needs prescription-level or diagnostic care, your clinician will say so and point you to the right pathway, but starting the conversation doesn't require one.
How many sessions does active acne treatment usually take on darker skin?
Course length varies by presentation and is set after your clinician has assessed your skin in person, but most people begin with a small number of sessions and reassess from there. A single session is a reasonable place to start if you're deciding whether the approach is right for you.
