When Should You Start Laser Hair Removal? — Why Fall Is the Right Time

Hair removal light works by selective photothermolysis — a long word for a simple idea. The light is absorbed by melanin, the pigment that gives hair and skin their color, and that absorbed energy turns into heat inside the follicle. Melanin in the hair is the target; melanin in the surrounding skin is not.

A tan adds melanin to the skin. The light then has two places to be absorbed instead of one, the contrast between hair and skin narrows, and settings have to be chosen more conservatively to keep the surrounding skin comfortable. Un-tanned skin gives the widest gap between target and background — which is exactly the condition the treatment is designed for.

Why this applies to us in the same way

At our studio, hair removal is performed with IPL — intense pulsed light, which is what many people mean when they say laser hair removal. IPL uses a broad spectrum of pulsed light rather than a single laser wavelength, and the filter is tuned to your skin tone. The physics is the same: melanin absorbs the light, the follicle heats, the hair thins over the series. Which is why the tan rule is not a laser rule or an IPL rule — it is a melanin rule, and it applies either way, as it does across the other laser and light treatments at our Highland Park clinic.

Take the arithmetic seriously and the planning becomes easy.

• Start in September. Six sessions at four-week intervals finish around February. Eight sessions at six-week intervals finish around August.
• Start in October or November. You are still comfortably finished or nearly finished by the following summer, with room for a missed appointment.
• Start in April. The back half of your course lands in peak sun season, which is when the sun-avoidance windows are hardest to keep and when a vacation is most likely to interrupt.

There is nothing wrong with starting in spring — plenty of people do, and it works. It simply asks more of your calendar. Fall asks less.

If you want the detail on why the sessions are spaced the way they are and what happens after the course ends, our guide to how many sessions you need covers the full series. And if you are still weighing options, the treatment finder takes about a minute.

They are less restrictive than they sound, and they are easier to keep between October and April — which is the whole point.

• Two to four weeks of sun avoidance before each session. Direct sun on the area being treated, and tanning beds or sun lamps at any point. The American Academy of Dermatology is unambiguous on the tanning-bed part.
• The same window afterward. Freshly treated skin is more reactive, and strict sun protection is standard post-treatment care in the clinical guidance.
• Self-tanner comes off completely before you come in. It is pigment sitting on the skin, and the light cannot tell the difference between a bottle and a beach.
• Daily SPF between visits on any treated area that sees daylight. This is the habit that keeps the whole series on schedule.
• Shaving is fine and usually asked for. What matters is leaving the follicle intact — so no waxing, plucking or epilating during the course.

On the North Shore, the months from October through April make every line on that list nearly automatic. That is the real seasonal advantage: not that the treatment works differently in November, but that you find it far easier to do it properly.

A winter trip somewhere sunny. Workable, and common. The interval between sessions has flexibility built in, so a session can be moved rather than squeezed. Tell us the dates at your consultation and the schedule is built around them from the start instead of being repaired later.

A tan right now, in August. Then this is a good month to plan and a poor month to begin. Tans fade, and starting once yours has is the difference between a cautious first session and a properly calibrated one. Booking the consultation now and the first session for a few weeks out is the usual answer.

A course you already started in spring. Keep going — an interrupted series does not reset, it just stretches. The follicles you have already treated stay treated. What matters is protecting the treated areas from sun between now and your next visit.

Your first visit is a conversation and a skin assessment before it is a treatment. We look at your skin tone and hair color, review your health history, and set the filter and settings accordingly — then map out the session dates across the months ahead so you can see the whole course at once.

Our hair removal treatments use medical-grade IPL, with the filter matched to your skin tone rather than a single fixed setting. Underarms, legs, bikini, face and smaller areas are all treatable, and the plan is built around the areas you actually want rather than a package.

We serve Highland Park, Deerfield, Northbrook, Glencoe, Lake Forest, Winnetka, Glenview and the wider Chicago North Shore. Individual results vary, and your plan is confirmed at a consultation.