How Much Hair Should Fall Out After Session of Laser Hair Removal (Bikini)?

I've had one session 2 weeks ago. It seemed like a really quick session. I've had a few hairs fall out - once they fall out, are they permanently gone? Do hairs continue to fall out over time, and I won't really know how effective the treatment was for weeks yet? Or should all the hair fall out the first time, and then a portion regrows, and that's when you do your next session?

Doctor Answers 13

Laser Hair Removal

We suggest to spread your laser hair treatments 4-6 weeks apart based on the hair growth cycle. With each treatment the active growing hair is destroyed, creating less of a blood supply to the follicle, making the hair that grows back weaker and thinner. Ideally every hair in the treatment area will die and fall out with each treatment.

New York Dermatologist
4.4 out of 5 stars 5 reviews

Hair removal treatments require multiple treatments

Don't expect to have all the hair fall out after just one laser or IPL hair removal session. Multiple treatments are required because hairs cycle and only actively growing hairs are effected with each treatment. Expect to do at least six treatments about 3-4 weeks apart.

Dina D. Strachan, MD
New York Dermatologist
3.3 out of 5 stars 10 reviews

Laser hair removal and fall out

appropriate laser hair removal involves shaving of the hair so that there is no hair shaft sticking high above the surface, otherwise too much energy may be absorbed by the epidermis and the skin could get burned.  Therefore, within two weeks you shouldn't see hair fall out because it was already shaved off.  The hair that grows out will take some time to do so and will shed probably without your seeing it.

Ronald Shelton, MD
Manhattan Dermatologic Surgeon
4.9 out of 5 stars 37 reviews

Hair Reduction After a Session of Laser Hair Removal

The amount of hair that falls out at each session of laser hair removal can vary. Hairs grow in 3 different phases, and laser hair removal is effective against hairs in the growing phase. If the hairs are in the correct phase, they should be permanently reduced. Some hairs can be ejected from the follicle immediately, while some can continue to grow and fall out over the next few weeks. We usually recommend neck and face treatments to be done every 4 weeks and any body area below the neck every 6 weeks so that the hairs will hopefully be in the correct phase for laser hair reduction. Some treatments will yield a lot of hair removal while others will result in very little hair removal. It just depends on the phase of growth.

Steven H. Williams, MD
San Francisco Plastic Surgeon
4.8 out of 5 stars 49 reviews

About 20% should be removed during one session

You should see at least 20% of the hair fall out after each session. If you only had a few hairs and your session was short I’m assuming that your treatment wasn’t done properly or the laser wasn’t set at the right parameters. The hair on the bikini area is usually dark and thick so it should work faster and better. You still need to do at least six sessions for the best results, but you should notice a big improvement after each treatment. We use Lightsheer Duet which I think is the best tool on the market right now

Gregory Turowski, MD, PhD, FACS
Chicago Plastic Surgeon
4.5 out of 5 stars 58 reviews

Laser Hair Removal

Laser hair removal takes at least five sessions and we space them at different intervals depending where the hair is on the body.  For example, the face grows fastest and requires treatment every four weeks and the legs grow slower and may require re-treatment every 6 to 8 weeks.  Since the hair is shaved in between treatments you should notice less new growth in between each treatment.  Please consult an expert in laser hair removal for the best cosmetic results.  Best, Dr. Green

Michele S. Green, MD
New York Dermatologist
5.0 out of 5 stars 76 reviews

Hair removal

hair falls with different type of responses in different people and based on the setting used. 

You should talk to your supervising doctor if the technician did not answer your questions about expectations. Different machines act a bot different but normally you need several sessions and between 2 weeks to 2 month between the sessions ( different body parts have different time schedules). the hair that is dead is going to remain that way for a long time but inactive hair will become active and come out that needs to be dealt with. In each session just a fraction of hair will be affected not all of them. 

Parham Gharagozlou, MD, FACP
Walnut Creek Physician
5.0 out of 5 stars 4 reviews

Laser Hair Removal

Usually you get about a 20% reduction of the hair after the 1st treatment. It can take as long as 2 weeks for all of the hairs to fall out after a treatment. I usually recommend using an exfoliating loufa sponge in the shower to help pull the hairs out faster. Laser treatments should be 4-6 weeks apart for the binini area as the regrowth cycle of the hair is every 28-32 days. Each hair is in a different phase of the growth cycle, so depending on the phase the hair is in will determine if the hair is affected or not. It will take a minimum of 4-6 treatments and about  an 85% maximum reduction should be expected. The hair that remains will be very fine though. If you truly want to know how effective the treatment was you would have to let the hair grow out for 6-8 weeks.

Neda Vanden Bosch, MD
West Palm Beach Physician
5.0 out of 5 stars 19 reviews

How much hair falls out with each treatment?

Ideally, every hair in the growth phase will fall out or shed after a laser hair treatment.  Since not all hair is in the growth phase, only a portion of the hair can be removed during each session.  Each treatment should either have less hair or finer hair from previous treatments.  

Anil R. Shah, MD
Chicago Facial Plastic Surgeon
4.8 out of 5 stars 163 reviews

Laser Hair Removal

The amount of hair that falls out after each treatment is 15%-20%. Laser hair removal is done when the hair is in its growth phase. An area with a faster growth cycle (like bikini area) can be treated every 4 weeks. An area with a longer growth cycle (like the legs) can be treated every 6-8 weeks. Continue your treatment to see maximum results

Hardik Soni, MD
Summit Emergency Medicine Physician
5.0 out of 5 stars 45 reviews

These answers are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.