Medically reviewed by Dr Prratyush More, dermatologist

Summary: Before your first laser hair reduction session, shave the area the day before, avoid sun and tanning for two to four weeks, stop waxing, plucking, threading and bleaching for at least four weeks, pause active skincare near the area, and arrive with clean, product-free skin. Just as important, and often left off checklists: have a patch test, tell your practitioner about every medication and skin condition, and never apply your own numbing cream. These steps affect both safety and how well the session works.

Preparation matters more than most first-time patients expect. A handful of simple steps in the days and weeks before your appointment affect your comfort during treatment, your safety, and how much the laser can actually achieve.

Here is what to do, what to avoid, and why each one matters.

Do: Shave the Area 12 to 24 Hours Before

Shave the treatment area the day before your session so the laser targets hair inside the follicle rather than wasting energy on hair sitting above the skin.

There is a safety reason as well as an efficiency one. Long hair above the skin heats up under the laser and transfers that heat sideways into the surrounding skin instead of down into the follicle, which is how surface burns and singeing happen.

Use a clean, sharp razor and avoid shaving so close that you leave the skin raw. Broken or irritated skin on the day of treatment can mean the area is skipped. If you would rather not shave yourself, many clinics will do it for you at the appointment.

Avoid: Sun Exposure and Tanning for Two to Four Weeks

Avoid sun exposure, tanning beds and self-tanning products for at least two weeks before your session, and ideally four.

Laser works by targeting pigment. A recent tan raises the pigment level in your skin itself, which means the laser is more likely to heat the skin rather than the hair — the direct route to burns and pigment changes. Self-tanner is a particular trap, because it colours the skin

without any of the usual signals of sun exposure and needs time to fade completely.

If you arrive with a fresh tan or any sunburn, expect your session to be postponed. That is the practitioner protecting you, not being difficult.

Do: Stop Waxing, Plucking, Threading and Bleaching for Four Weeks

Stop waxing, plucking, threading, epilating and bleaching the treatment area for at least four weeks beforehand. Shaving is the only method safe to continue right up to your appointment.

It is worth understanding why, because the usual explanation is wrong. Waxing and plucking do not remove the follicle — the follicle is a permanent structure in the skin, which is exactly why hair grows back after every wax. What epilation removes is the pigmented hair shaft inside the follicle. That shaft is the laser’s target. Pull it out and the laser has nothing to aim at, so the follicle is left untouched and that hair simply regrows.

Bleaching causes the same problem by a different route: it strips the melanin out of the hair, and melanin is what absorbs the laser energy.

This is also why you should not wax or thread between sessions later in your course. Shave instead.

 

Do: Have a Patch Test First

A patch test — a small test area treated at your intended settings, usually 24 to 48 hours before the first full session — is standard practice and particularly important for Indian and other deeper skin tones, where the margin between effective and excessive energy is narrower.

Your consultation should also establish your skin type and confirm which device suits it. If a clinic offers to run a full first session with no patch test and no skin assessment, that is worth questioning.

 

Do: Tell Your Practitioner About Medications and Skin History

This is the step most checklists skip, and it matters more than any of the cosmetic ones. Mention:

• Any medication that increases light sensitivity, including doxycycline and other antibiotics, certain diuretics and anti-inflammatories, and St John’s wort.
• A history of cold sores, if you are having the upper lip or bikini area Laser can trigger a flare, and antiviral tablets started before the session prevent it.
• Any active skin problem in the area — infection, eczema flare, open or broken
• A tendency to keloid or thickened
• Recent chemical peels or microdermabrasion, and any
• Pregnancy, since treatment is usually
• Tattoos or prominent moles in the treatment area, which are covered or avoided rather than treated over.
• Irregular periods, acne or other signs of a hormonal cause, which can be driving the hair growth and change what results to

On isotretinoin specifically: many clinics still ask patients to wait six months after finishing it. That rule comes from the drug’s packaging insert rather than good evidence. Expert consensus panels reviewing the literature concluded there is insufficient evidence to delay hair removal lasers for people currently or recently on isotretinoin, and a comparative study found no significant difference in side effects between isotretinoin patients and controls.

Practice varies, so discuss it rather than assuming you are excluded.

Note that this does not extend to waxing, which should still be avoided on isotretinoin because it can tear the skin.

 

Avoid: Active Skincare Near the Treatment Area

Pause retinoids, exfoliating acids and other actives on or near the area for about five to seven days beforehand. These thin the outer skin layer and increase sensitivity, which raises the risk of irritation and pigment change. It matters most for facial areas like the upper lip and chin.

If a prescription retinoid is part of your routine, say so at consultation rather than assuming it is irrelevant. Your practitioner may adjust settings or specify a particular pause.

 

Avoid: Applying Your Own Numbing Cream

If you are nervous about discomfort, ask the clinic rather than buying anaesthetic cream yourself.

Topical anaesthetics applied thickly over large areas — especially under clothing or wrap, which increases absorption — can be absorbed into the bloodstream in dangerous amounts. Serious harm has been reported. Any numbing should be applied in the amount and area your practitioner specifies.

 

Do: Arrive With Clean, Product-Free Skin

Come with the treatment area clean and free of lotion, deodorant, makeup, sunscreen and perfume. Residue on the skin absorbs laser energy at the surface, which is the opposite of what you want, and some products contain particles or shimmer that make this worse.

Deodorant is the one people forget before underarm sessions. Wash it off beforehand — and rather than reapplying immediately afterwards, give freshly treated skin around 24 hours, or use a plain, fragrance-free product if you need something sooner.

 

What to Expect on the Day

You will be given protective goggles and asked to keep them on throughout. This is not optional — laser light can cause permanent eye injury, and both you and the operator should be wearing appropriate eye protection for the wavelength being used. If eyewear is not offered, ask for it.

The sensation is usually described as a brief snap or hot flick, eased by the device’s cooling. Mild redness and small bumps around the follicles afterwards are normal and usually settle within a day or two.

 

Frequently Asked Questions

How soon before my appointment should I shave? The day before, roughly 12 to 24 hours ahead. That clears surface hair without leaving time for regrowth, and lets any minor razor irritation settle.

What happens if I have a tan? A recent tan or sunburn raises the risk of burns and pigment changes, and your session may be postponed. Self-tanner counts, and needs time to fade fully.

Can I wax between laser sessions if I get impatient? No. Waxing, plucking and threading empty the follicle of the hair the laser needs to target, so that follicle gets skipped. Shaving is the only safe option between sessions.

Do I need to stop all skincare? Not all — just actives such as retinoids and exfoliating acids near the treatment area, for about five to seven days. Mention your routine at consultation.

Is it okay to wear deodorant to an underarm session? Arrive without it. Afterwards, wait about a day before reapplying, or use something plain and fragrance-free.

Can I have laser if I’m on acne medication? Often yes, including isotretinoin, though practice varies between clinics and it should be discussed. Some antibiotics increase light sensitivity, so disclose everything you are taking.

Why does the clinic need my medical history for a cosmetic treatment? Because laser is a medical procedure. Medications, skin conditions, cold sore history, scarring tendency and hormonal causes all change the settings used, the precautions taken, and what results are realistic.

 

Getting Ready for Your First Session

None of these steps are arbitrary. Each one affects either the safety of the session or how effectively the laser can reach the follicle. Skipping them can mean settings are dialled back conservatively, or treatment postponed altogether.

Under dermatologist-led care, preparation is treated as part of the result rather than an afterthought — with a full consultation, skin type assessment and patch test before any first session, so anything specific to your skin is picked up in advance.

Book a consultation and get a prep checklist built around your skin and the area you want treated.

This article is for general information and does not replace individual medical advice. Laser hair reduction is a medical procedure that should be carried out under qualified supervision after assessment of skin type and medical history.