Procedure

Laser Hair Removal

A laser that heats the pigment inside a hair to damage the follicle growing it. It reduces hair rather than removing it for good, and it does not work on gray, white, red or very blond hair.
Dr. Schwarz, MD · Board-certified dermatologistLast reviewed September 8, 2026
16:9 hero for Laser Hair Removal. Never cropped: the tone strip and the corner logo depend on the full frame.

Start here

The disappointment I see most often is someone who paid for six sessions on hair the laser was never going to see: the target is pigment, and gray, white, red and very blond hair has too little of it, so the answer there is electrolysis, not a different clinic. The other word I repeat is reduction — a finished course leaves far fewer, finer hairs, and most people need a top-up once or twice a year. If facial hair is new, coarse and increasing, I want to know why first, because a hormonal driver switches on new follicles faster than the laser retires them. On deeper skin tones a 1064 nm Nd:YAG is the safe choice and older alexandrite machines and IPL are where the burns and pale patches come from, so ask what wavelength they use and ask for a test patch before booking a course.

— Dr. Schwarz, Board Certified Dermatologist

Key Facts

−
Also calledLaser hair reduction, diode laser, Nd:YAG hair removal. IPL is a related light treatment but not a laser
DowntimeNone. Redness and small bumps around each hair for a few hours to 2 days
SessionsUsually 6 to 8 to start, 4 weeks apart on the face and 6 to 8 on the body, then top-ups
Typical costIn the US, usually well under $150 a session for a small area such as the upper lip, and several hundred for large areas such as full legs
Results timelineTreated hairs shed over 1 to 3 weeks. The hair count drops with each session
PainA hot snap with each pulse. Coarse hair and the Nd:YAG sting the most
Hair colorDark hair only. Gray, white, red and very blond hair has too little pigment to target
Skin tone safetySafe on deeper skin tones with a 1064 nm Nd:YAG and careful settings. Older alexandrite devices and IPL carry a real risk of burns

What It Is

−

A laser aimed at the pigment inside the hair, which heats and damages the follicle growing it. Three wavelengths are in common use: 755 nm alexandrite, 810 nm diode and 1064 nm Nd:YAG. They differ in how deep they reach and how much the skin's own pigment competes for the energy, which decides which suits your skin tone. IPL is not a laser but is often sold as one: broadband light, filtered rather than tuned. It works on dark hair and lighter skin, but it is less precise and riskier on deeper skin tones. The approved US wording is permanent hair reduction, chosen carefully: a lasting drop in the number of hairs, not skin that never grows hair again.

How It Works

−

Melanin, the pigment in the hair shaft, absorbs the laser light and turns it into heat. The heat runs down the shaft to the base of the follicle and the cells partway up it, and damages the follicle's ability to grow another hair. Nothing is aimed at the skin; the hair is the antenna.

Hair grows in cycles, and only follicles in the growing phase have a pigmented hair attached to the target. The rest are resting and effectively invisible to the laser. That is why treatment is a course spaced weeks apart, and why hair keeps appearing between visits.

The skin contains melanin too, so it competes for the same light. The greater the contrast between dark hair and lighter skin, the easier the job. Longer wavelengths such as 1064 nm are absorbed less by surface pigment and reach deeper, which is why the Nd:YAG is safer on deeper skin tones; surface cooling protects further. Where the hair has almost no pigment there is nothing to absorb the light, and no setting changes that.

Skin is about two millimetres thick on the face. How deep a treatment reaches decides what it can change, and whether it treats all of the skin or scattered columns of it decides how long you take to heal.

How it works
Compare
Skin basics
EPIDERMISDERMISFAT0.05 mm — pigment0.5 mm — texture + pores1.0 mm — collagen1.5 mm — deep dermisPEELNEEDLINGNON-ABLATIVE LASERABLATIVE LASERGOES BELOW THE SKIN

This works below the skin altogether, in the fat or the muscle beneath it. Nothing applied to the surface reaches here, which is the whole reason the procedure exists — and why it is done by injection, by needle or with a blade rather than with a cream.

A peel or a scrub takes the skin off evenly from the surface down. Everything above the line goes and nothing below it is touched, which is why peels suit surface pigment and rough texture, and why the whole face flakes for a few days after.

Needles make hundreds of separate channels and leave the skin between them untouched. That untouched skin is what heals the rest, so recovery is quick — but a needle only injures the skin to start repair. It removes nothing.

The light passes through the surface and heats a column underneath it. The surface stays whole, so you leave red rather than raw — and it takes a course of sessions rather than one.

The laser removes columns of skin outright: the white gaps here are tissue that is gone, and new skin grows in from the sides. The strongest of the four, and the longest to heal.

The outer layer, and the only one anything in a jar reaches. It renews itself constantly: a cell made at the bottom takes about a month to reach the surface and flake off. Most of what a skincare product does, it does here.

The living layer underneath, holding the blood vessels, the nerves and the collagen. It is where lasting change happens and it is hard to reach: most of what is sold for the skin never gets this far.

What It Treats

−
Ingrown Hairs
Strong evidence
The most durable treatment there is for this, because it reduces the number of hairs that can become ingrown at all. It usually takes a series of sessions and it thins rather than eliminates hair for most people, with occasional touch-ups. It is the option to ask about when scarring is starting or when a job requires close shaving.
Folliculitis
Moderate evidence
For folliculitis and razor bumps driven entirely by shaving, particularly in the beard and neck, reducing the hair removes the cause instead of treating the result. It usually takes six or more sessions and works best with a device suited to your skin tone, since the wrong one can burn or leave marks on deeper skin. It is worth considering after months of the same bumps rather than after one crop.
Hidradenitis Suppurativa
Hidradenitis Suppurativa
Moderate evidence
Removing the hair removes the follicle that plugs, and several courses of treatment reduce flares in early disease. It works best on Hurley stage one and two, before tunnels form. On deeper skin tones the device matters: the long-pulsed Nd:YAG is the usual choice, and the wrong laser causes burns and pigment change. Ask which one the clinic will use.

Not the Best For

−
Keratosis Pilaris
Keratosis Pilaris
Limited evidence
Removing the hair takes away the thing that gets trapped under the plug, and small studies show the bumps and roughness improve with it. It is expensive for a harmless condition, which is why it is rarely the first plan. It makes most sense for someone already having the area treated for hair.
Gray, White, Red and Blond Hair
Doesn't work
Light hair has no pigment to absorb the laser, so gray, white, red and very blond hair do not respond. Fine dark hair responds less well than coarse dark hair. Electrolysis works regardless of hair color.

Pros and Cons

−
Pros
  • Fast over large areas A back or both legs takes under an hour.
  • Fewer ingrown hairs The Nd:YAG is used specifically for razor bumps.
  • Lasting reduction Far fewer, finer hairs; shaving rarely, not daily.
  • Little downtime Redness and small bumps for a day or two.
Cons
  • Dark hair only Gray, white, red and very blond hair will not respond.
  • It is reduction, not removal Top-ups once or twice a year are normal.
  • Hormones can outrun it With a hormonal cause, new follicles keep switching on.
  • Device and settings decide safety Routine or a burn, depending on the operator.
  • The cost is upfront and repeated You pay for the course before you know.

How to Prepare

−
4 weeks before2 to 4 weeks beforeThe day before
Actives and hair removal
4 weeks before
No waxing, plucking, threading, epilating or hair-removal creams for the whole course; the laser needs the root in the follicle. Stop retinoids and acids a few days before.
Sun and tanning
2 to 4 weeks before
Avoid sun and self-tanner on the area, and never be treated on tanned skin.
Shaving and clean skin
The day before
Shave close the day before or that morning; hair above the surface burns. No deodorant, makeup or lotion on the area.

What Happens

−
ArrivingThe treatmentLeaving
Arriving
Skin and hair are assessed and settings chosen for your skin tone and hair type. A test patch is usual at the first visit. Everyone in the room wears eye protection. Numbing is rarely needed; a chilled tip, cold air or gel does the work, and cream is used sparingly because it can mask pain that warns of a burn. Your provider will ask about these things.
The treatment
The handpiece is pressed on the skin and pulsed in overlapping passes. Each pulse feels like a hot elastic band flicked at the skin, with a smell of singed hair. An upper lip takes a couple of minutes, full legs 30 to 60. The Nd:YAG stings more than the diode, and the first session on dense hair is the worst.
Leaving
Pink skin with small raised bumps around each hair, like goosebumps; that means the follicles absorbed the energy. A cool pack and plain moisturizer go on, and most people carry on as normal.

Recovery

−
Days 1 to 3Weeks 1 to 3Weeks 4 to 8
Days 1 to 3
The bumps and pinkness settle over hours to two days, and the area feels like mild sunburn. Avoid saunas, hot showers, hard exercise, scrubs and acids meanwhile.
Weeks 1 to 3
Treated hairs work their way out of the skin and look exactly like regrowth. Wipe them away or exfoliate gently. This is not new hair.
Weeks 4 to 8
The area stays smooth, then resting follicles enter their growing phase and hair appears. Expected, and why the next session is already booked.

Aftercare

−
48 hours24 to 48 hours2 to 4 weeks
Heat
48 hours
No saunas, hot tubs, steam rooms or very hot showers.
Exercise
24 to 48 hours
Sweat on freshly treated follicles causes bumps and folliculitis.
Sun
2 to 4 weeks
SPF 30 or higher daily on exposed areas, and no deliberate sun or self-tanner for 2 to 4 weeks.
Skincare
Restart retinoids and acids once the redness has settled, usually after 2 to 3 days.
Hair removal between sessions
Shaving only — no waxing, plucking, threading or epilating.

Risks

−

Redness and small bumps for a day or two are expected. The problems that matter come from too much energy for the skin tone, tanned skin, or the wrong device.

Burns and blisters
Usually from a setting too high, the wrong wavelength for your skin tone, or tanned skin. They need treating promptly to avoid a lasting mark.
Dark patches
Brown discoloration a few weeks later, post-inflammatory hyperpigmentation. More common on deeper skin tones and after sun, and usually fades over months.
Pale patches
Loss of pigment in the treated area. Less common than dark patches, slower to recover, sometimes permanent.
Paradoxical hair growth
Uncommon, but new fine hairs can appear at the edge of a treated area, usually on the face and neck. Managed by treating that area too.
Folliculitis
Red or pus-topped bumps a few days later, from sweat or bacteria in healing follicles. Settles on its own.
A cold sore flare
Treatment around the mouth or bikini line can set one off.

In Deeper Skin Tones

−

Laser hair removal works well on deeper skin tones with the right device. Melanin in the surface of the skin competes with the hair for the light, so the risk is the skin absorbing energy meant for the follicle.

The 1064 nm Nd:YAG is the safe choice: absorbed least by skin pigment, deep enough to reach the follicle. Safe practice means longer pulses, lower energy, strong surface cooling, a test patch with a week or two of waiting, and more spacing between sessions. Older alexandrite devices and IPL cause most reported burns and pale patches on deeper skin tones. The Nd:YAG stings more; that is the trade-off.

Never be treated on tanned skin or after self-tanner. If a dark patch appears, treat it early with strict sun protection and a pigment cream if advised, rather than booking the next session.

One condition worth naming: razor bumps, or pseudofolliculitis barbae, where coarse curly hair grows back into the skin. The Nd:YAG genuinely helps, and this is one of the few times hair removal is medical rather than cosmetic. Ask which wavelength the clinic uses.

If You Stop

−

There is no rebound and no penalty for stopping. Destroyed follicles do not come back. What returns is hair from follicles that were only weakened, and from those that were resting.

Most people who stop partway keep a real reduction, with gradual return over months to a couple of years, usually finer and sparser. Hair does not grow back thicker after laser; the shedding of treated hairs after a session is often mistaken for it.

If hormones are driving the growth, return is faster because new follicles keep switching on. Treating the driver alongside the laser is what makes the result hold.

Combining Treatments

−
Same day
Shaving
Expected between sessions, and it does not affect the result.
Same day
Eflornithine cream
This prescription cream slows facial hair regrowth alongside a course.
Same day
Hormonal treatment
A combined pill or spironolactone treats the cause and helps the result hold.
Same day
Electrolysis
Finishes the gray, white, red and blond hairs the laser cannot see.
Same day
Razor bump creams
Often combined with the Nd:YAG.
Wait 2 weeks
Other procedures
Leave about 2 weeks around a peel, injectable or another laser.
Wait 4 weeks
Between sessions
4 weeks on the face, 6 to 8 on the body.
Until healed
Sun tan
Wait for any tan to fade completely.
Don’t combine
Tattoos
Never treat over a tattoo or permanent makeup; the laser targets the ink and burns.
Wait 6 months
Isotretinoin
Many providers wait about 6 months, a judgment call rather than a rule.

Insurance Coverage

−

Packages of six are cheaper per session, but buying before a test patch means paying before you know whether your hair responds. Very low prices often mean IPL, not a laser. Insurance treats hair removal as cosmetic and almost never covers it. Two partial exceptions: recurrent pilonidal disease, and hair removal before some gender-affirming surgeries. Both vary by plan and need pre-approval.

Ask Your Doctor

−
If you are pregnant or breastfeeding
Ask the doctor managing your pregnancy. Most providers wait.
If your hair is gray, white, red or blond
There is no pigment to target. Electrolysis works regardless of color.
If facial hair is new and increasing
Look into a hormonal cause before paying for a course.
If you have a deeper skin tone
Ask which wavelength will be used, and expect a test patch.
If you are tanned or use self-tanner
Treating tanned skin risks burns and pale patches. Wait until it fades.
If you take a sun-sensitizing medicine
Doxycycline, some diuretics and others make skin more reactive. Say what you take.
If you have had keloid or thick scars
Settings should be conservative; a burn is likelier to leave a raised scar.
If you get cold sores near the area
Treatment can trigger an outbreak; antiviral medicine works best started early.
If you have a tattoo in the area
The laser cannot pass over ink, so it is worked around.
If you have vitiligo or melasma
Heat and injury can aggravate both. Discuss it first.
If you finished isotretinoin recently
Many providers wait about 6 months. Say when your last dose was.
If a previous session left a mark
The settings or device were wrong for your skin. Review that before continuing.

At-Home Versions

−
Home IPL devices
Okay alternative
Lower powered than clinic devices, so they need more sessions and give less reduction. They work best on dark hair and lighter skin, and many are not cleared for deeper skin tones. Read the tone chart on the box and follow it.
Shaving
Good alternative
Does nothing to the follicle, but it is the cheapest and safest option, it is exactly what you should do between laser sessions, and it does not make hair grow back coarser.
Depilatory creams
Good alternative
Dissolve hair at the surface and leave the root in place, so they can be used during a laser course. They irritate some skin, so stop a few days before a session.
Waxing, plucking, threading and epilating
Good alternative
Remove hair for weeks at a time, but they pull out the root the laser needs. Stop 4 weeks before starting and for the whole course.
Prescription eflornithine cream
Good alternative
Slows facial hair growth while it is used. It is not removal, and growth returns after stopping.

How It Compares

−
Electrolysis
Electrolysis
The same
The only method that works on any hair color, including gray, white, red and blond, and the only one described as permanent removal. The trade-off is speed: it treats one hair at a time, so a large area takes months to years.
Waxing, threading and epilating
Worse
Weeks of smooth skin for a low price, repeated indefinitely. They cannot be used during a laser course, because they remove the follicle target.
Shaving
Different job
Free, safe and immediate, with no effect on the follicle. It is also the correct way to manage hair between laser sessions.
Prescription eflornithine cream
Different job
For slowing facial hair. It is not a removal method and works only while it is being used, so it is usually combined with something else.
Hormonal treatment
Different job
Where a hormonal condition is driving the hair. It treats the cause rather than the hair, works slowly over months, and needs a prescription and monitoring.
Home IPL devices
Worse
Much cheaper over time and done on your own schedule. Lower powered, so results are smaller and slower, and many are not suitable for deeper skin tones.

Finding a Provider

+

Rules on who may operate a hair removal laser vary by state: some limit it to physicians, physician assistants and nurse practitioners, others allow trained technicians under supervision. Medical spas and salons fall under different rules than medical offices.

The question that matters most is which device is in the room. Ask for the wavelength by name, not the brand: 755 nm alexandrite, 810 nm diode or 1064 nm Nd:YAG. Ask whether IPL is being sold as laser, ask for a test patch, ask how many patients with your skin tone they treat, and what they would do about a burn or a dark patch.

Red flags: a promise of permanent removal, a package sold before a test patch, no eye protection for everyone, one device for every skin tone, treating visibly tanned skin, and no discussion of what your hair color means.

Myths

+
  • "Laser hair removal is permanent." The approved wording is permanent hair reduction: far fewer, finer hairs, with a top-up once or twice a year.
  • "It works on any hair color." It targets pigment, so gray, white, red and very blond hair does not respond. That is physics, not the clinic.
  • "It is not safe on deeper skin tones." It is, with a 1064 nm Nd:YAG and careful settings. The risk comes from an older alexandrite device or IPL on skin it does not suit.
  • "IPL is the same thing as laser." IPL is broadband light, not a tuned wavelength — less precise, and riskier on deeper skin tones.
  • "Shaving between sessions ruins the results." Shaving is exactly what you should do. Waxing, plucking and threading pull the target out of the follicle and waste the session.
  • "The hair grows back thicker." It does not. Treated hairs are pushed out over the weeks after a session, and that shedding gets mistaken for new growth.

Questions Patients Ask

+

Is laser hair removal permanent?

It is permanent hair reduction, not removal. A course leaves far fewer, finer hairs, with a top-up once or twice a year. Some follicles are destroyed for good, others only weakened.

Does it work on gray, blond or red hair?

No. The laser targets pigment, and these colors have too little of it. No device or setting changes that. Electrolysis works regardless of color.

How many sessions will I need?

Usually 6 to 8 for the main result, 4 weeks apart on the face and 6 to 8 on the body, then top-ups. Hormone-driven hair needs more, and the cause treated alongside.

Is it safe on deeper skin tones?

Yes, with a 1064 nm Nd:YAG and careful settings. The risk comes from older alexandrite devices, IPL, energy too high, or tanned skin. Ask which wavelength will be used and for a test patch.

Why does hair appear a week after my session?

Treated hairs are pushed out over the next one to three weeks, which looks exactly like regrowth. Wipe or exfoliate them away. New growth from resting follicles shows around week four to eight.

Can I shave between sessions?

Yes, and you should. Shaving leaves the root in place, which is what the laser needs. Waxing, plucking and threading remove the target and waste the appointment.

References

+