Laser Hair Removal

How does laser hair removal work?

Hair contains melanin, the pigment that absorbs the treatment’s light energy. The resulting heat damages the follicle. Hair responds best during its active growth phase, but follicles enter that phase at different times. Repeated appointments reach hairs that were outside the target stage at an earlier visit. Cleveland Clinic explains the mechanism and growth cycle.

The aim is to reduce the amount of hair that grows back. Decide what that would change for you: shaving your legs less often, fewer visible chin hairs, or less time removing underarm hair. Ask the provider how it will track that goal across the course, including the hair that remains between appointments.

For fine, downy hair, the assessment can be different. Leeds Teaching Hospitals says this hair is unsuitable for its laser service. Have the actual hair examined before agreeing to treat an area simply because the clinic sells a package for it.

Which skin and hair types can be treated?

Dark hair generally responds best because it provides a stronger pigment target. Blonde, white and gray hair contain less pigment; red hair also responds less effectively. Darker skin can be treated, but its melanin absorbs energy too, so the device and settings need careful selection by an experienced provider. Mayo Clinic’s guidance on hair and skin color.

A 2020 systematic review examined 12 comparative trials in people with Fitzpatrick skin types III–VI. It found broadly similar outcomes across the studied laser and IPL treatments, with some differences in effectiveness and side effects. Long-pulsed Nd:YAG caused less post-inflammatory darkening than IPL in the pooled comparison. The findings do not establish a device that is best for every patient.

For very light hair, ask about alternatives. The AAD’s hair-removal guide identifies electrolysis as an option that can treat light hair. A clinic should explain why it expects the hair you have to respond to the treatment it proposes.

Common laser treatment areas include the legs, underarms, upper lip, chin and bikini line. Mayo advises against treating the eyelids, eyebrows or surrounding eye area, and against treating tattooed skin. Mayo’s treatment-area guidance.

Facial hair can also need a medical assessment. A 2024 review of six studies involving 423 women with PCOS found improvements in excess hair growth and related psychological outcomes after laser or light treatment, but judged the evidence to be of low certainty. For new or increasing thick facial hair, discuss the possible cause as well as removal. The NHS guidance on hirsutism explains when to seek an assessment.

How many sessions will you need?

Patient guidance gives different estimates. The AAD’s FAQ describes two to six treatments, while Mayo Clinic describes four to eight. The AAD says many patients can have appointments four to six weeks apart; the treating clinician decides the interval. These ranges help plan a course, but they cannot determine how many sessions your hair will need.

Hair sheds over days or weeks after treatment. Results can last for months or years, and some people need follow-up appointments to control regrowth. Mayo Clinic describes shedding and maintenance.

Research also varies in how it measures success. A 2022 systematic review found five eligible randomized trials involving 223 patients when it required follow-up spanning at least a full hair-growth cycle for the treated area. The reviewers explain in their methods that differences between the trials prevented a pooled meta-analysis. A reduction percentage needs the treated area, measurement method and follow-up date beside it.

Laser, IPL and home devices

IPL stands for intense pulsed light. It delivers a range of wavelengths that can be filtered for a treatment target. A laser uses a specific wavelength. Both can treat hair, but a service described as “laser hair removal” may use either technology. Ask for the device’s name and type. ASDS explains the distinction.

Wavelengths from Gan and Graber’s review.

For darker skin, a review focused on Fitzpatrick types IV–VI identifies wavelength and energy settings as parts of a safe treatment protocol. Compare the provider’s experience with people of your skin tone, its assessment of your hair, and its plan for managing a reaction.

Home IPL has evidence of hair reduction. A systematic review of home dermatology devices supported home IPL for this purpose, while noting limited randomized evidence and gaps in long-term efficacy and safety data.

That review also does not validate every device on sale. If you are considering home treatment, check the exact model’s permitted skin tones, hair colors, body areas and schedule. The AAD says home treatment takes longer and requires periodic use to maintain results. A professional treatment result cannot be assumed for a different home device.

Before your appointment

The consultation should cover recent tanning, your tendency to scar or develop keloids, any history of cold sores or genital herpes, and the medicines you take. The AAD specifically asks about past isotretinoin use and current medicines, including those bought without a prescription. Bring a complete medication list to the consultation. AAD’s preparation guidance.

Ask the clinic for its preparation instructions before the first visit. UCSF advises avoiding waxing, plucking and electrolysis for at least a month beforehand: shaving leaves the root available for treatment. Confirm when to shave, which products to avoid on the area, and whether the appointment should be postponed after recent sun exposure. UCSF’s preparation protocol.

Protect the skin from sun exposure and avoid tanning and self-tanner. The AAD recommends daily broad-spectrum, water-resistant SPF 30 or higher before going outdoors. A tan belongs in the consultation even if it does not look like sunburn. AAD’s sun-protection advice.

A test patch can help assess how your skin responds. Leeds Teaching Hospitals explains that a good test result still leaves some risk during later treatment. Ask when the patch will be checked and what reaction would change the plan. Leeds’ patch-test guidance.

What treatment and recovery feel like

The operator cleans the area, provides protective eye goggles and treats the skin with the device. A topical anesthetic may be offered, although many patients do not need one. You may feel brief stinging or warm pinpricks. Appointment length depends on the size of the area. UCSF describes the procedure.

Discomfort, redness and swelling are common after treatment. The AAD describes these minor effects as typically lasting one to three days and says people generally return to everyday activities. AAD’s recovery guidance.

Follow the clinic’s instructions for cooling, washing and sun protection. UCSF advises gentle cleaning and avoiding picking or rubbing the treated skin. Exact aftercare schedules vary between providers; get the instructions in writing and ask how to contact the clinic if the skin reacts. UCSF’s aftercare.

Blistering or scabbing warrants contacting the clinic, according to Leeds Teaching Hospitals. Do not wait for the next routine appointment to ask about a reaction that concerns you.

What can go wrong?

Burns, blisters, changes in skin color, infection and scars are possible complications. The AAD recommends an experienced board-certified dermatologist for laser treatment. Ask about the operator’s training and who will assess a complication. AAD’s safety guidance.

Laser and IPL can also trigger increased hair growth, called paradoxical hypertrichosis. A 2021 systematic review and meta-analysis found an association with treatment on the face or neck. The complication was rare outside those areas.

For facial treatment, ask the provider to assess the hair you want removed, explain this risk and describe how it would handle increased growth. The review had insufficient data to establish the association with sex or skin type.

How much does laser hair removal cost?

The price depends on the treatment area, number of sessions, provider and location. The American Society of Plastic Surgeons advises asking the provider for the complete fee. A national average for a broad category of laser skin treatments cannot tell you what an underarm course in your city will cost.

Ask for an itemized quote that records:

• The exact areas included, with the clinic’s definition of “bikini,” “Brazilian” or “full body.”
• The price per session and the number included in a package.
• Any separate consultation, test-patch or other charges.
• The price of additional sessions and maintenance.
• Expiry, cancellation and refund terms for prepaid treatment.

Compare quotes for the same areas and number of appointments. Ask what happens financially if the clinic reassesses your suitability, stops treatment because of a skin reaction, or recommends more sessions than the package includes.

Choosing a laser hair removal clinic

The AAD recommends asking about the provider’s experience treating your skin coloring, expected results and possible side effects. The American Society for Dermatologic Surgery also asks whether a doctor is on site and whether you have had a medical-history review and an assessment of suitability.

Request a written plan before paying for a course. It should identify the device, areas, proposed appointment schedule, expected result, costs and route for follow-up. When a clinic quotes a reduction percentage, ask which study or patient measurements support it and how long after treatment they were checked.