The trouble is that melanin sits in two places.
Laser hair removal works by aiming light at melanin, the pigment that gives hair its color. The follicle absorbs the light, converts it to heat, and the heat damages the structures that grow the hair. On paper it is an elegant idea.
Melanin does not only live in your hair. It also lives in your epidermis, the outermost layer of skin. In very fair skin with dark hair the contrast is enormous, and the laser easily tells target from background. As skin gets deeper that contrast narrows, and the surface begins competing with the follicle for the same energy.
When the epidermis absorbs energy meant for the follicle, you get the outcomes that gave laser its old reputation in deeper skin: blistering, crusting, patches turned darker or lighter than the skin around them. The real question was never whether melanin-rich skin can be treated. It was how to get energy down to the follicle without cooking the surface on the way.
There are three levers, and a careful provider uses all three.
Wavelength is the first lever.
Different wavelengths are absorbed by melanin to very different degrees. Shorter wavelengths are absorbed avidly. Longer wavelengths are absorbed far less and travel deeper before giving up their energy.
Our Motus AZ+ carries both ends of that trade:
- Alexandrite, 755 nm. Efficient at finding melanin, which makes it strong on fine and medium hair. That same efficiency is what historically made it off-limits for deep skin. What changed is how the energy arrives: the Moveo technique breaks each dose into subpulses, delivered in motion at low fluence through a cooled sapphire tip, and that delivery is what lets the Motus platform treat the full range of skin tones.
- Nd:YAG, 1064 nm. Absorbed far more weakly by melanin, so it passes through the epidermis with less interference. It carries the longest track record in the literature for treating Fitzpatrick types IV through VI.
A 2025 study in Lasers in Medical Science treated 55 women with Fitzpatrick types IV, V and VI using a 1064 nm laser with sapphire contact cooling and reported no adverse events. Earlier work in the Journal of Drugs in Dermatology reached the same conclusion: with the right settings, deeply pigmented skin can be treated effectively. Studies describe a group, not you. That is what a consultation is for.
Energy and timing are the second.
Wavelength decides where the energy goes. Fluence, meaning how much energy lands per unit of skin, decides how much of it there is. Pulse width decides how fast it arrives.
The instinct is that more energy means better results. In melanin-rich skin that instinct is wrong, and expensively so. The 2025 study found that low fluence, 25 J/cm², proved effective across the group. Turning the machine up does not make a follicle more responsive. It makes the epidermis more likely to be injured.
Timing matters for a reason worth knowing. Your epidermis is thin and sheds heat quickly. A follicle is larger and holds heat much longer. Deliver energy slowly enough and the surface cools itself between moments while the follicle keeps accumulating. Deliver it all at once and both heat together. Slower is not gentler. It is more selective.
Delivery is the third.
The Motus AZ+ uses a Moveo handpiece, which changes how energy arrives rather than changing the physics. A sapphire tip stays in contact with the skin, cooling it continuously and cutting the energy that would otherwise reflect off the surface. Rather than firing one high-energy pulse at a stamped square, the handpiece glides over the area, stacking many low-fluence subpulses so the follicle heats gradually while the surface never has to absorb a single large hit.
That combination is the second route to treating deeper skin safely: lowering the energy per pass and cooling the surface throughout so it never accumulates much heat to begin with. It is also why clients describe the treatment as a warm massage rather than a series of snaps. The comfort is pleasant. The thermal protection is the point.
Three questions to ask before anyone treats you.
You do not need to become a laser physicist. You need three answers, and how a clinic handles them tells you plenty.
1. Which wavelength will you use on me, and why?
You are not listening for one specific number. You are listening for a reason. A clinic that answers “our laser is safe for all skin tones” without naming a wavelength or describing a technique has not answered the question. Ask again.
2. Will you patch test first?
A patch test puts the proposed settings on a small, discreet area and waits. On melanin-rich skin this is not a formality, and we do it where appropriate. It is how a careful provider finds the right starting point for you rather than for a category you have been sorted into.
3. What happens if I get hyperpigmentation?
A provider who says it never occurs has either treated very little deep skin or is not watching closely. The answer you want describes a plan: pause the series, protect the area, treat the pigment, resume at adjusted settings. Post-inflammatory hyperpigmentation is usually temporary and usually manageable, and it is far easier to manage when someone expected the possibility.
What a course actually looks like.
Hair grows in cycles, and only follicles in the active growth phase are vulnerable at any given moment. That one fact explains the whole schedule: you are waiting for each follicle to present itself.
Most areas need roughly six to eight sessions spaced four to six weeks apart, which typically produces substantial long-term reduction in the treated area. Areas differ more than people expect: arms and legs tend to respond quickly, underarms and bikini are more resistant, and the chin and upper lip are the most stubborn of all, particularly when hormones are driving the growth. Expect to return for occasional maintenance. Current session counts, area sizing and candidacy live on the laser hair removal page.
Where laser is not the answer.
- Very light blonde, gray, white or red hair. These carry little or no melanin, so there is no target to absorb the light. This has nothing to do with your skin tone, and no setting fixes it.
- A fresh tan. Recent sun raises the melanin in your epidermis, narrowing the contrast the laser depends on and raising risk. This matters in a Dallas August. If you have been in the sun, the right answer is to wait, not to lower the settings and proceed.
- Hormonally driven hair. Laser reduces the hair that exists. It does not change the signal that recruited it, so conditions like PCOS can bring new follicles into play. Laser still helps, but it works better alongside a workup, and our comprehensive lab testing is where that conversation starts.
- Certain medical situations. Pregnancy and breastfeeding, a history of keloid scarring, active skin infection in the area, isotretinoin within the past six months, and some photosensitizing conditions all change the calculus. Bring your history to the consultation.
Aftercare carries more weight on melanin-rich skin.
Melanin-rich skin responds to inflammation by making more pigment. That tendency is why aftercare here is not optional.
- Sun protection, seriously. Broad spectrum SPF 30 or higher on treated areas, reapplied. Sun after a session is the most common route to unwanted darkening.
- Skip heat for a day or two. Hot yoga, saunas, long hot showers and hard workouts keep treated skin inflamed longer than it needs to be.
- Shave between sessions. Do not wax, thread or tweeze. The laser needs an intact follicle with pigment in it. Pulling the follicle contents out removes the target, and you will have paid for a session with nothing to aim at.
- Ease off strong actives briefly. Retinoids and acids can wait a few days while the skin settles.
- Tell us if you see darkening. It usually resolves, and it resolves faster with attention. If pigment is already a concern for you, the pigmentation and sun damage page covers what else we can do, including pico toning, which is deliberately gentle for exactly this reason.
The short version.
Deep skin was excluded from laser hair removal for years because the devices available could not tell the pigment in a follicle from the pigment in a face. Subpulsed delivery, lower fluence, continuous cooling and wavelength choice closed most of that gap. What remains is not a technology problem but a judgment problem, which comes down to who is holding the handpiece and whether they can tell you why they chose the settings they chose.
For the broader picture of how the service runs, our general guide to laser hair removal at Rejuvia covers preparation, treatment areas and what sessions feel like. If what you actually want is to stop shaving, start at unwanted hair.
Straight answers, no hype.
Consultations are free, and for melanin-rich skin they are worth having before you commit to a series. We will look at your skin, tell you which wavelength we would use and why, patch test where appropriate, and say honestly if laser is the wrong tool for the hair you want gone.