Laser Hair Removal Aftercare: What to Expect, Hour by Hour

Most of what happens after a laser hair removal session is unremarkable, and most of the worry people feel in the first week comes from not knowing which of those unremarkable things is supposed to happen.

This is what to expect hour by hour, what to avoid and why, and the short list of things that genuinely warrant a phone call rather than a wait-and-see.

The first few hours

Expect the treated area to feel warm, like mild sunburn, and to look pink. You may also see small raised bumps around individual follicles — this is called perifollicular oedema, and despite being the thing that alarms people most, it is the clearest sign the treatment reached the follicle rather than just warming the skin.

Both usually settle within a few hours. On coarser areas such as the bikini line or underarms they can last into the next day.

What helps:

• A cool compress — a clean cloth, cool water, ten minutes at a time. Not ice directly on the skin.
• Loose clothing over the area, particularly after bikini or Brazilian treatment where a waistband sits right on it.
• Aloe or a plain, fragrance-free moisturiser if the skin feels tight.

What does not help is anything active. Leave the retinol, the acids and the scrubs alone for now — more on that below.

Forty-eight hours: the things to avoid, and why

The rule most clinics give is “no heat, no sweat, no sun for 48 hours”. Here is the reasoning, because knowing why makes it much easier to follow.

The laser has deliberately heated the follicle and the skin around it is mildly inflamed. Adding more heat prolongs that inflammation, and inflamed skin is more prone to pigment changes afterwards. Sweat and moisture in a warm environment also raise the risk of folliculitis, because the follicles have just been through something.

So for two days:

• No hot showers or baths. Warm is fine. Hot is the one that stings and prolongs the redness.
• No sauna, steam room or hot tub.
• No gym, running or anything that makes you sweat heavily.
• No swimming. Chlorine on freshly treated skin is an irritant, and public pools add a bacterial risk you do not need.
• No direct sun on the treated area, and no sunbeds at all.

After 48 hours, normal routine resumes — with the exception of sun protection, which matters for considerably longer.

The shedding phase, which nobody warns you about

Somewhere between five days and two weeks after a session, treated hairs start working their way out of the follicle. They push up through the skin and fall away, and while it is happening it looks exactly like regrowth.

It is not. Those hairs are already dead; the follicle is simply expelling them.

People frequently book a worried follow-up at this point, or conclude the session did not work. Neither is necessary. What you can do is help it along gently — a soft washcloth or a light exfoliating mitt, a few days after treatment, encourages the shedding and reduces the chance of a hair getting trapped. Gentle is the word; you are not scrubbing.

If you already deal with recurring trapped hairs, our guide to stopping ingrown hairs covers the mechanics.

Sun protection, which lasts longer than 48 hours

This is the aftercare instruction that gets ignored most and matters most.

Freshly treated skin is more reactive to UV, and sun exposure on it raises the risk of post-inflammatory hyperpigmentation — dark patches that can take months to fade. Beyond that, a tan changes what settings are safe at your next appointment, so a sunny weekend can cost you a session.

Use a broad-spectrum SPF 30 or higher on any treated area that sees daylight, every day, for the duration of your course. If you have a holiday planned, tell us before you book rather than after: we can space your sessions around it.

What to leave off the skin

For about a week after each session, keep these away from the treated area:

• Retinoids and retinol — they accelerate turnover on skin that is already recovering.
• Glycolic, salicylic and other exfoliating acids.
• Physical scrubs — different from the gentle shedding help above, which is a light pass with a cloth rather than an abrasive.
• Fake tan. It has to be fully off before your next session anyway, and applying it to freshly treated skin can go patchy.
• Perfumed products, including heavily fragranced body lotion.

Deodorant after underarm treatment is worth its own note. Give it 24 hours, then use whatever you normally use. If you find it stings, switch to something unfragranced for a few days — the irritation is usually the alcohol content rather than the deodorant itself.

Between sessions: shave, do not pull

You can shave the treated area as soon as it is comfortable, usually after a couple of days, and you should keep shaving between appointments as normal.

What you must not do is wax, pluck, thread or epilate. All of them remove the hair from the follicle — and the follicle with a hair still in it is exactly what the laser needs to find at your next session. Removing it makes that session much less effective. This is the single most common reason a course underperforms.

Depilatory creams are also best avoided during a course; they are harsh on skin that is being treated regularly.

A few notes by area

• Face — leave makeup off for 24 hours if you can. Skin here reacts more visibly and settles faster than people expect.
• Underarms — deodorant after a day, and expect this area to feel warm for longer than most because the hair is coarse.
• Bikini and Brazilian — loose cotton for a couple of days. Friction from tight clothing on treated skin is what turns mild irritation into something more persistent.
• Legs — the main one is the gym. Forty-eight hours, then back to normal.

When to call the clinic

Most reactions settle on their own. These do not, and are worth a call rather than a wait:

• Blistering, or skin that stayed white or grey after treatment.
• Pain that is still there the next day, rather than warmth that faded within hours.
• Redness that spreads beyond the treated area, or feels hot to the touch.
• Pus, or a rash that worsens over 48 hours rather than settling.
• Any dark or light patch appearing in the treated area in the weeks afterwards.

None of these is common, and reporting one is not making a fuss — it is how settings get adjusted for your next session. We would far rather hear about it early.

Common questions

How long does redness last after laser hair removal?

Usually a few hours, sometimes into the next day on coarser areas like the bikini line or underarms. It should look and feel like mild sunburn. Redness still present after 48 hours, or spreading beyond the treated area, is worth a call to the clinic.

Can I shower after laser hair removal?

Yes, but keep it warm rather than hot for the first 48 hours. Heat prolongs the inflammation and is the thing most likely to make the area sting. Avoid saunas, steam rooms, hot tubs and swimming for the same two days.

Why does the hair look like it is growing back after a week?

That is the shedding phase, not regrowth. Between five days and two weeks after a session, treated hairs work their way out of the follicle and fall away. They are already dead. Gentle exfoliation with a soft cloth helps them along.

When can I use deodorant after underarm laser hair removal?

After about 24 hours. If it stings, switch to something unfragranced for a few days — the irritation is usually the alcohol content rather than the deodorant itself.

Can I shave between laser hair removal sessions?

Yes, and you should. Shaving is fine as soon as the area is comfortable. What you must avoid is waxing, plucking, threading or epilating, because those remove the hair from the follicle and the laser needs the hair present to work at your next session.

Do I need sunscreen after laser hair removal?

Yes, and for longer than the other aftercare rules. Use broad-spectrum SPF 30 or higher on treated areas that see daylight, for the whole course. Sun on freshly treated skin risks lasting dark patches, and a tan changes what settings are safe at your next session.

Booking

Femme Laser Clinic is a women’s clinic with twelve locations across Ontario and British Columbia. Aftercare instructions are sent with every appointment, and if something does not look right between sessions you can call the clinic that treated you.

Read our preparation guide for what to do before a session, the full laser hair removal guide for how a course works, or book at your nearest clinic.