Laser hair reduction

What does the laser target?

Hair melanin absorbs light and converts it into heat. The aim is controlled follicular injury while limiting injury to surrounding skin: selective photothermolysis. Hairs do not share the same growth stage, so one session cannot affect every follicle equally. Skin also contains melanin, which is why device selection, cooling and the operator's skill matter.

Section sources: Health Canada — Laser Hair Removal: Safety Guidelines for Facility Owners and Operators (2011)

Hair colour and thickness shape the decision

Dark, coarse hairs are generally more suitable targets than fine vellus hairs. White, grey and many blonde or red hairs lack enough target pigment and respond poorly or unpredictably. Darker skin is not an automatic exclusion, but the operator needs experience with that skin tone. Compare electrolysis for light hairs: the method should fit your hair, rather than a sales package.

Section sources: American Academy of Dermatology — 6 ways to remove unwanted hair · MyHealth Alberta — Electrolysis for Removing Hair

There is no universally best device

Alexandrite and diode systems reduce hair in selected study populations; small trials cannot identify a permanent winner for every body site and skin tone. Long-pulsed Nd:YAG is often considered for darker skin, but is not risk-free. IPL is filtered broad-spectrum light, not a laser. Wavelength is only one factor alongside pulse delivery, cooling, the actual device and skin assessment. Never copy energy or pulse settings from the internet.

Section sources: Comparison of long-pulsed diode and long-pulsed alexandrite lasers for hair removal: long-term clinical and histologic study (2001) · Prospective comparative evaluation of three laser systems for axillary hair removal (2005) · Long-pulsed Nd:YAG laser versus IPL for hair removal in dark skin: a randomized controlled trial (2012)

Tanning and test patches

Disclose sun exposure, tanning beds and self-tanners: your current skin colour matters, not just your usual complexion. A representative test patch and time to observe delayed reactions support assessment; the clinician and manufacturer determine the interval. A normal patch does not guarantee that a full treatment cannot burn or alter pigmentation. New medicines, tanning or a different device may require reassessment.

Section sources: British Medical Laser Association — How to make a patch work: Laser treatments and patch tests (2021) · Health Canada — Cosmetic Laser Treatments

Hormonal hair growth and pregnancy

Laser does not treat the hormonal cause of hair growth. PCOS may require additional sessions; medical management and hair reduction can complement each other. Sudden or rapidly increasing hair growth, voice changes or accompanying symptoms warrant medical assessment. Quebec public health recommends postponing laser and electrolysis during pregnancy because safety studies are lacking; this precaution is not proof of fetal harm.

Section sources: Recommendations from the 2023 International Evidence-based Guideline for the Assessment and Management of PCOS · Institut national de santé publique du Québec — Personal care during pregnancy (updated February 2026)

What to disclose before booking

Bring prescriptions, non-prescription medicines, supplements and topical products. Flag current or previous isotretinoin, photosensitising medicines and drugs affecting healing. Disclose cold sores, raised scars, post-inflammatory pigmentation, active skin disease or infection. Drug-related light sensitivity is not identical across medicines or wavelengths. Do not stop necessary treatment yourself; the prescriber and laser clinician should decide whether to postpone or adjust anything.

Section sources: American Academy of Dermatology — Laser hair removal: Preparation · British Medical Laser Association — Drugs and Lasers/IPLs

Preparation needs an individual timetable

Obtain written instructions. Waxing, threading or plucking removes the target hair from its root; your clinic should specify when to stop. Shaving is often permitted, but its timing and the use of depilatory creams depend on the protocol. Arrive with skin prepared as instructed. Sunburn, broken skin or active inflammation needs review before treatment. Do not independently apply numbing cream over large areas.

Section sources: Leeds Teaching Hospitals NHS Trust — Laser Hair Reduction · American Academy of Dermatology — Laser hair removal: Preparation

During treatment: comfort and protection

Warmth or brief snapping sensations may occur. Report severe or suddenly increasing pain immediately so treatment can stop for assessment. Everyone exposed needs device-appropriate eye protection; closed eyes and sunglasses are not substitutes. Ask about cooling, equipment hygiene and complication support. Tattoos, uncertain pigmented lesions and the eye area require specific professional assessment. Hair removal is not a way to diagnose or erase an unknown mark.

Section sources: Ottawa Public Health — Electrolysis and Laser Hair Removal Services · Health Canada — Cosmetic Laser Treatments

What results are realistic?

The usual goal is lasting reduction in hair number, thickness or shaving frequency, rather than guaranteed lifelong removal of every hair. Body site, hormones, hair characteristics and treatment affect response. A course and sometimes maintenance are needed. Long-term reviews find relatively few suitable trials; a study percentage is not your personal forecast. Session spacing should reflect regrowth and skin assessment, rather than simply a package's session count.

Section sources: Efficacy of lasers and light sources in long-term hair reduction: a systematic review (2022) · American Society for Dermatologic Surgery — Hair Removal

Understanding ordinary recovery

Redness, mild warmth and small swellings around follicles can follow treatment and should trend towards improvement. A clean, cool compress may soothe; do not place ice directly on skin. Treated hairs shed gradually: avoid squeezing, scrubbing or plucking them out. Symptom severity and direction matter more than a rigid hourly deadline. Increasing pain or redness, blisters or discharge should not be dismissed as normal recovery.

Section sources: American Academy of Dermatology — Laser hair removal: FAQs · MedlinePlus — Minor burns: aftercare · Leeds Teaching Hospitals NHS Trust — Laser treatment patient leaflet

Early aftercare and sun protection

Limit friction, scratching, hot showers, saunas, strenuous exercise and fragranced products while skin settles. Clinics differ on when to restart shaving, swimming, makeup and usual skincare; follow your protocol and skin condition. Start with shade and clothing. On intact skin, once tolerated, use broad-spectrum SPF 30 or higher and reapply according to its label. Do not force sunscreen onto an open blister or wound; request specific advice.

Section sources: Sandwell and West Birmingham Hospitals NHS Trust — Laser hair removal patient leaflet · Leeds Teaching Hospitals NHS Trust — Laser Hair Reduction

Useful product categories, without brand claims

For intact but dry or tight skin, consider a gentle fragrance-free cleanser and a simple fragrance-free moisturiser. Glycerin and dimethicone can support moisture retention; tolerability of the whole formula matters more than a fashionable ingredient. Introduce unfamiliar products cautiously after skin settles. Avoid irritating exfoliants, acids, retinoids and scrubs on inflamed skin until advised. A soothing product cannot treat a burn, infection or persistent pigmentation change.

Section sources: American Academy of Dermatology — Dermatologists' top tips for relieving dry skin · Sandwell and West Birmingham Hospitals NHS Trust — Laser hair removal patient leaflet · MedlinePlus — Minor burns: aftercare

Complications to understand beforehand

Possible complications include burns, blisters, infection, cold-sore reactivation, darker or lighter patches and occasionally scarring. Follicular inflammation can resemble acne, but a photograph cannot exclude infection. Increasing pain or redness, pus, spreading warmth or fever needs same-day medical assessment. Do not self-treat a new mark with strong acids or bleaching agents before its cause and any active injury are assessed. Review a complication before another session.

Section sources: Leeds Teaching Hospitals NHS Trust — Laser treatment patient leaflet · Health Canada — Laser Hair Removal: Safety Guidelines for Facility Owners and Operators (2011) · MedlinePlus — Minor burns: aftercare

Blistering, burns or eye symptoms: act promptly

Cool a fresh burn under cool running water for about 20 minutes while arranging help. Avoid direct ice, toothpaste, oils, multiple creams and popping blisters. Do not independently start topical steroids, antibiotics or acids on a burn. Severe, extensive, facial or sensitive-site burns require urgent assessment. Eye pain, light sensitivity or altered vision after exposure needs urgent eye assessment; sudden vision loss warrants emergency care. In a Canadian emergency, call 911.

Section sources: NHS — Burns and scalds · MedlinePlus — Minor burns: aftercare · NHS — Eye pain

Can treatment increase hair growth?

Yes. Paradoxical hypertrichosis is unexpected increased hair growth after laser or light treatment, rather than ordinary regrowth. A systematic review linked it particularly with the face and neck, but variable studies cannot give a precise individual risk. Discuss benefits versus this risk before treating facial vellus hair. If it occurs, obtain comparable photographs and seek dermatologist review; automatic continuation, higher power or switching to a home device is not a universal solution.

Section sources: Paradoxical Hypertrichosis Associated with Laser and Light Therapy for Hair Removal: systematic review and meta-analysis (2021)

Check the provider, device and progress

Ask for the exact manufacturer and model, experience with similar skin, informed consent, written aftercare, total cost and a complication contact. Match the device and manufacturer to the relevant active Canadian licence; a logo, sticker or FDA claim alone does not establish Canadian licensing. A device licence does not certify a clinic's skill or your suitability. Track comparable photographs, shaving frequency and skin reactions; keep lighting, distance and time since shaving consistent.

Section sources: Health Canada — Medical Devices Active Licence Listing: Overview · Health Canada — Counterfeit laser hair removal and therapy devices found in some clinics · American Society for Dermatologic Surgery — Hair Removal

Compare options; final selection needs skin and hair assessment

Frequently asked questions

Related guides to explore

• RF microneedling
• Ablative resurfacing · full-field or fractional
• Nonablative fractional laser
• Pigment-targeting laser & IPL
• Vascular laser & light

Sources and context

Canadian sources take priority for regulatory context. FDA or other foreign information does not establish Canadian authorization for a product or use. A source-check date is distinct from publication date or independent clinical approval.

1. Health Canada — Laser Hair Removal: Safety Guidelines for Facility Owners and Operators (2011)Canadian federal safety guidance; older foundational document · 2026-10-17
2. American Academy of Dermatology — 6 ways to remove unwanted hairUS specialist society patient guidance · 2026-10-17
3. MyHealth Alberta — Electrolysis for Removing HairCanadian provincial patient information · 2026-10-17
4. Comparison of long-pulsed diode and long-pulsed alexandrite lasers for hair removal: long-term clinical and histologic study (2001)Small comparative clinical study; older devices and selected skin types · 2026-10-17
5. Prospective comparative evaluation of three laser systems for axillary hair removal (2005)Small prospective comparative study; mainly phototype II · 2026-10-17
6. Long-pulsed Nd:YAG laser versus IPL for hair removal in dark skin: a randomized controlled trial (2012)Randomized within-patient trial in phototypes IV–VI; site- and device-specific · 2026-10-17
7. British Medical Laser Association — How to make a patch work: Laser treatments and patch tests (2021)UK laser specialist commentary explaining association guidance · 2026-10-17
8. Health Canada — Cosmetic Laser TreatmentsCanadian regulator consumer guidance; older overview · 2026-10-17
9. Recommendations from the 2023 International Evidence-based Guideline for the Assessment and Management of PCOSInternational evidence-based clinical guideline; not a Canadian prescribing protocol · 2026-10-17
10. Institut national de santé publique du Québec — Personal care during pregnancy (updated February 2026)Canadian provincial public health guidance · 2026-10-17
11. American Academy of Dermatology — Laser hair removal: PreparationUS specialist society patient guidance; Canadian practice may differ · 2026-10-17
12. British Medical Laser Association — Drugs and Lasers/IPLsUK professional consensus; medicines guidance version 2, May 2017 · 2026-10-17
13. Leeds Teaching Hospitals NHS Trust — Laser Hair ReductionUK hospital-specific patient protocol; not a universal timetable · 2026-10-17
14. Ottawa Public Health — Electrolysis and Laser Hair Removal ServicesCanadian municipal public health service-safety guidance · 2026-10-17
15. Efficacy of lasers and light sources in long-term hair reduction: a systematic review (2022)Systematic review of randomized trials; only five eligible long-term trials · 2026-10-17
16. American Society for Dermatologic Surgery — Hair RemovalUS specialist society patient guidance · 2026-10-17
17. American Academy of Dermatology — Laser hair removal: FAQsUS specialist society patient guidance · 2026-10-17
18. MedlinePlus — Minor burns: aftercareUS National Library of Medicine patient guidance · 2026-10-17
19. Leeds Teaching Hospitals NHS Trust — Laser treatment patient leafletUK hospital patient guidance on laser risks and infection · 2026-10-17
20. Sandwell and West Birmingham Hospitals NHS Trust — Laser hair removal patient leafletUK hospital-specific aftercare; older leaflet · 2026-10-17
21. American Academy of Dermatology — Dermatologists' top tips for relieving dry skinUS specialist society guidance; general barrier-care principles, not a laser-product trial · 2026-10-17
22. NHS — Burns and scaldsUK public health first-aid guidance; emergency access adapted to Canada · 2026-10-17
23. NHS — Eye painUK urgent eye-symptom guidance; emergency access adapted to Canada · 2026-10-17
24. Paradoxical Hypertrichosis Associated with Laser and Light Therapy for Hair Removal: systematic review and meta-analysis (2021)Systematic review; predominantly observational evidence with substantial heterogeneity · 2026-10-17
25. Health Canada — Medical Devices Active Licence Listing: OverviewCanadian regulator device verification · 2026-10-17
26. Health Canada — Counterfeit laser hair removal and therapy devices found in some clinicsCanadian regulator safety alert · 2026-10-17