Laser Hair Removal: Is It Permanent, How Many Sessions, and How to Prepare

Part of: Lasers & devices

The laser targets hair pigment, so it works best on dark hair. Results are permanent on most body areas but not on a woman's face, and most people need 2 to 6 sessions, every 4 to 6 weeks.

Procedures · 2 min read · August 22, 2026

Written and medically reviewed by Dr. Yousef Abo Zarad · German board-certified dermatologist · Last reviewed: September 2026

Key takeaways

  • The laser targets hair pigment, so it works best on dark hair.
  • Results are permanent on most body areas, but not on a woman's face because of hormones.
  • Most people need 2 to 6 sessions, every 4 to 6 weeks.
  • Darker skin can be treated safely with a suitable laser and an experienced doctor.
  • Tanning before a session is one of the main causes of complications.

How does laser hair removal work?

Pigment in the hair absorbs the laser energy and turns it into heat that weakens the follicle. That's why lasers work best when hair and skin color contrast, such as dark hair on light skin.

Newer devices have made treatment possible for a wider range of skin and hair colors, but the device and settings are still chosen case by case.

Are the results permanent?

Once the sessions are complete, hair removal is permanent on most areas of the body. On a woman's face it isn't permanent, because hormones can stimulate new hair growth, and maintenance sessions may be needed.

How many sessions do you need?

Typical sessions
ItemTypical
Number of sessions2 to 6 for most people; some need more
Time between sessionsEvery 4 to 6 weeks
Women's faceMay need maintenance sessions because of hormones

Is it suitable for darker skin?

Yes, provided there is enough contrast between hair and skin color and a laser suited to darker skin is used. Some lasers are safe on darker skin where others may not be.

Darker skin is more prone to burns and dark marks if settings aren't chosen carefully, so ask about the doctor's experience with your skin tone specifically.

How do you prepare for a session?

  • Don't tan, outdoors or indoors, and don't use sunless tanners.
  • Use a broad-spectrum, water-resistant sunscreen with SPF 30 or higher every day.
  • Tell your doctor if you take or have taken isotretinoin or any other medicines.
  • Tell them if you tend to scar or form keloids, get cold sores, or have a recent tan.

What to expect after a session

  • Discomfort, redness and mild swelling for 1 to 3 days, the most common effects.
  • Keep direct sunlight off the treated area.
  • Don't use tanning beds or sun lamps.

What are the rare complications?

  • Blistering.
  • A cold-sore (herpes) flare.
  • Infection.
  • Scarring.
  • Lightening or darkening of the skin.
Most of these become much less likely with an experienced dermatologist, the right settings and untanned skin.

An added benefit

Laser hair removal also helps people with razor bumps and ingrown hairs, because it reduces the need for frequent shaving.

Common questions

  • Does it hurt? Most people feel mild discomfort that passes quickly.
  • Does it work on blond or white hair? Lasers rely on hair pigment, so results are weaker the less pigment there is.
  • Can I have it at a beauty salon? It's best done under a dermatologist's supervision, especially for darker skin.

Medical Evidence

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