Why Do Dermatologists Always Say to Start Laser Hair Removal in Winter?
The reason to start laser hair removal in winter isn't just marketing — it comes down to hair growth cycles and UV exposure.
Why Do Dermatologists Always Say to Start Laser Hair Removal in Winter?
If you've ever looked into laser hair removal, you've probably seen the same advice everywhere: "Start in winter." But if hair is most bothersome in summer, why start when it's cold outside? The reason isn't marketing — it's rooted in how laser hair removal actually works.
Laser hair removal isn't a one-and-done procedure. It follows the natural cycle of hair growth, which is why timing matters more than most people realize.
Laser Hair Removal Only Targets Hair That's Actively Growing
Laser hair removal works by targeting pigment inside the hair follicle*.
*Hair follicle: The root from which hair grows. It contains melanin pigment, which absorbs laser energy and carries it down to the follicle.
The key challenge is that not all hairs grow at the same time. Some are actively growing, some are resting, and some are in the process of shedding. Only hairs in the active growth phase can be effectively targeted in a single session.
Why Multiple Sessions Are Necessary
The proportion of hairs in the active growth phase varies by body area, but it's always just a fraction of the total. That's why sessions are spaced 4 to 8 weeks apart — so that hairs previously in the resting phase have time to enter the growth phase and can be targeted in subsequent visits.
Going through this cycle typically requires 5 to 10 sessions, which usually takes anywhere from 6 months to a year. Starting in winter means you'll be on track for noticeably smoother skin by the time summer arrives.
Sun-Tanned Skin Makes the Procedure More Complicated
A summer tan can actually work against you when it comes to laser hair removal. When there's more pigment in the skin itself, it becomes harder for the laser to selectively target the pigment in the hair follicle alone.
This also increases the risk of burns and post-inflammatory hyperpigmentation, which is why procedures are sometimes delayed after significant sun exposure. Seasons with lower UV intensity simply offer safer, more effective conditions for the procedure.
What Equipment Works Best for Coarse Hair?
For areas with coarser, denser hair — such as men's legs, beard, or underarms — dual-wavelength devices are commonly used. A system that combines Alexandrite* and Nd:YAG* wavelengths allows the practitioner to adjust settings based on your skin tone and hair thickness.
*Alexandrite (755nm): Highly responsive to pigment, making it well-suited for finer hair and lighter skin tones.
*Nd:YAG (1064nm): A deeper-penetrating wavelength that performs well on coarser hair and darker skin tones.
Rather than focusing on the device name, what matters most is whether the right wavelength is being selected for your specific skin type and hair characteristics.
**Q. Is it truly permanent?** A. Medically speaking, the term used is "permanent hair reduction." The hair becomes so sparse it's nearly unnoticeable, but some regrowth can occur over time due to hormonal changes or other factors.
**Q. Can I shave before my appointment?** A. Yes — shaving before your session is actually recommended. It has minimal impact on follicle pigment. However, avoid waxing or plucking, as removing the root leaves nothing for the laser to target.
**Q. Can I exercise on the day of the procedure?** A. It's best to avoid heat-generating activities such as saunas and intense workouts for 3 to 7 days after your session. These can place unnecessary stress on the treated follicles during the recovery period.
