The Complete Guide to Laser Hair Removal

Last updated: 9 August 2026

How laser hair removal works

Laser hair removal is one of the most requested aesthetic treatments worldwide. This offers a long-term solution to unwanted hair. The technology is based on the principle of selective photothermolysis, using specific wavelengths of light to target melanin (pigment) within the hair follicle whilst leaving surrounding tissue unharmed. The absorbed light energy converts to heat, damaging the follicular stem cells responsible for hair regrowth.

Practitioners use advanced laser technology suitable for a wide range of skin types and hair colours, delivering safe and effective hair reduction with lasting results.

The science of hair growth and laser targeting

Understanding the hair growth cycle is essential because laser hair removal is only effective during specific growth phases:

The hair growth cycle

• Anagen (active growth)the hair is actively growing and connected to the dermal papilla with maximum melanin content. This is the ONLY phase in which laser treatment is effective
• Catagen (regression)the hair detaches from the blood supply and stops growing. Transition phase lasting 2-3 weeks
• Telogen (resting)the hair is dormant and eventually sheds. Lasts 3-4 months for body hair

At any given time, only 20-30% of hairs are in the anagen phase. This is why multiple treatment sessions are required, each session targets a different cohort of hairs entering the growth phase.

Laser types used for hair removal

• Alexandrite (755nm)the gold standard for lighter skin types (Fitzpatrick I-III). Fast treatment speed, highly effective for fine and medium hair. Not safe for darker skin tones due to risk of melanin absorption in the epidermis
• Diode (800-810nm)versatile laser suitable for skin types I-V. Good penetration depth and efficacy across hair types. The most common laser used in commercial clinics
• Nd:YAG (1064nm)the safest option for darker skin types (Fitzpatrick IV-VI). Longer wavelength bypasses epidermal melanin, reducing burn risk. Less effective on fine or light hair
• IPL (Intense Pulsed Light)not technically a laser but uses broad-spectrum light. Effective for hair removal in lighter skin types but less specific than true laser devices

What to expect during treatment

1. Consultationskin type assessment, hair colour evaluation, medical history review, and patch test
2. Preparationthe treatment area must be shaved 24-48 hours before (this leaves the hair shaft within the follicle to absorb the laser energy). No waxing, plucking, or epilating for 4-6 weeks before treatment
3. Treatmentthe laser handpiece is applied to the skin in a systematic pattern. Built-in cooling systems protect the skin surface. Sessions range from 10 minutes (upper lip) to 60+ minutes (full legs)
4. Sensationdescribed as a snapping or warm prickling sensation. Modern devices with integrated cooling make treatment comfortable for most patients
5. Post-treatmentmild redness and perifollicular oedema (swelling around follicles) are normal and resolve within hours to days

Treatment Areas

Laser hair removal can be performed on virtually any body area:

• Face: Upper lip, chin, sideburns, jawline, neck
• Body: Underarms, arms, chest, abdomen, back, shoulders
• Bikini: Standard bikini line, extended bikini, Brazilian/Hollywood
• Legs: Full leg, lower leg, thigh
• Intimate areas: Specialist treatment available

Note: Treatment is not performed within the bony orbit (close to the eyes) due to risk of eye injury.

How many sessions are needed?

The number of sessions depends on the treatment area, hair type, and skin colour:

• Face: 8-12 sessions (facial hair has a shorter growth cycle with more hairs in anagen at any time)
• Underarms: 6-8 sessions
• Bikini: 6-10 sessions
• Legs: 6-8 sessions
• Back/chest: 6-10 sessions

Sessions are typically spaced 4-6 weeks apart for facial areas and 6-8 weeks for body areas, aligning with the hair growth cycle of each region.

Results and Expectations

• Average reduction: 70-90% permanent hair reduction after a full course
• Not 100% permanent: Laser hair removal is technically permanent hair reduction rather than permanent hair removal. Some fine, dormant follicles may reactivate over time
• Maintenance sessions: Annual or biannual top-up sessions may be needed to address hormonal regrowth or previously dormant follicles
• Progressive improvement: Hair becomes finer, lighter, and sparser with each session

Skin type and hair colour considerations

The ideal candidate has light skin and dark hair (maximum contrast between hair melanin and skin melanin). However, modern technology has expanded the treatable range:

• Dark hair on light skin (Fitzpatrick I-III): Excellent response. All laser types effective
• Dark hair on medium skin (Fitzpatrick III-IV): Good response with diode or Nd:YAG laser. Alexandrite with caution
• Dark hair on dark skin (Fitzpatrick V-VI): Nd:YAG only. Longer wavelength essential for safety. Good results achievable with appropriate settings
• Red/blonde/grey hair: Poor candidates for laser hair removal as these hair colours contain insufficient melanin for effective targeting. Electrolysis may be a better alternative

Safety and side effects

• Common: Temporary redness, perifollicular oedema, mild warmth (all resolve within hours to days)
• Uncommon: Blistering, crusting, temporary pigmentation changes (more common in darker skin or with inappropriate settings)

Contraindications

• Active tan or recent sun exposure (increases burn risk)
• Pregnancy (precautionary)
• Active skin infection in the treatment area
• Use of photosensitising medications
• Isotretinoin use within the past 6 months
• History of keloid scarring (relative contraindication)

“Laser hair removal remains one of the most effective and satisfying aesthetic treatments available. With appropriate patient selection and modern technology, excellent results can be achieved across all skin types.”, British Medical Laser Association

Frequently asked questions

Summary

Laser hair removal offers a safe, effective, and long-lasting solution to unwanted hair when performed by trained practitioners using appropriate technology. Understanding the science behind the treatment, the hair growth cycle, and the importance of skin type-appropriate laser selection is key to achieving optimal results. Clinics provide thorough consultations, appropriate technology for all skin types, and personalised treatment plans to deliver the best possible hair reduction outcomes.