After tedious hair-removal sessions spanning multiple appointments, the last thing you want to be concerned about is whether a light treatment used to remove hair could be reversed with another light treatment meant to grow hair?
At first, the question seems logical. On one hand, laser hair reduction (LHR) targets hair reduction; on the other, low-level light therapy (LLLT) has been studied for stimulating hair growth in certain types of hair loss. Low-level light therapy has shown benefits for hair density in androgenetic alopecia. However, the findings do not establish whether it affects follicles surviving laser or IPL hair removal, or whether it can restore permanently destroyed follicles. [1]
How Laser Hair Removal and IPL Reduce Hair Growth?
The Mayo Clinic describes laser hair removal as a process in which absorbed light is converted into heat that damages the hair follicles. [2] IPL (intense pulsed light) works on a similar principle, but instead of producing one specific laser wavelength, it delivers a broader spectrum of light to heat melanin-dense hair structures while limiting injury to the surrounding skin. [3]
A few things about hair biology to keep in mind. Hair follicles undergo repetitive cycles consisting of three stages: anagen (active growth), catagen (regression), and telogen (resting). Laser treatment is generally most effective when the hair is in the anagen phase. [4][5]Growth arrest varies depending on hair colour, thickness, growth stage and treatment settings. Some follicles sustain heavy damage while others retain the capacity to regrow hair. [2]
This is why “permanent hair reduction” is a more useful expectation than complete, lifelong hair removal. You may have a substantial reduction and still need occasional maintenance. When hair does return, it may be finer or less noticeable. [4]
How Red Light Therapy Interacts With Living Hair Follicles?
Red light therapy takes a completely different approach. Instead of trying to heat a follicle until it is damaged, red and near-infrared light are delivered at levels intended to influence cellular activity. This process is commonly referred to as photobiomodulation. [6] The interest in red light therapy and hair growth comes mainly from research on conditions such as androgenetic alopecia, where hair follicles are still present but are not functioning optimally.
A systematic review and meta-analysis of low-level laser and LED therapy in alopecia evaluated 38 studies involving more than 3,000 patients and reported improvements in hair density in androgenetic alopecia with specified treatment protocols. [1] Those findings do not establish that a red light panel device for at-home use will regrow hair on the body after laser treatment.
Can a Permanently Damaged Hair Follicle Be Reactivated?
At present, there is no direct clinical evidence to show that low-level light therapy (LLLT) can reconstruct a hair follicle that has been permanently destroyed by laser hair removal or IPL. The more logical question, therefore, is whether the follicle in question was completely destroyed in the first place. Sometimes it was not.
A follicle might have received less energy than intended, contained inadequate pigment, been in a less responsive phase of the growth cycle, or may have been weakened without eliminating its ability to produce hair completely. Any of those follicles could generate visible growth over time.
If it’s evident after someone begins using red light therapy, the timing can make the connection look obvious. But timing alone does not prove that red light therapy restored a dead follicle.
Why Hair May Reappear After a Successful Treatment Course?
If hair reappears after a successful LHR course, it does not necessarily mean the treatment failed, nor does it automatically imply that something you did afterwards reversed the results. Laser treatment does not eliminate every influence on hair growth. LHR treatments target existing pigmented hair, but cannot permanently remove the hormonal signals that influence hair follicular activity. A return of growth can therefore reflect an ongoing underlying issue or the need for maintenance, rather than a new device. [2]
There is also a less common possibility: paradoxical hypertrichosis. This refers to increased hair growth occurring after laser or light-based hair removal. Snast and colleagues found an overall prevalence of around 3%, with the face and neck much more frequently affected than other body sites. Rates varied considerably across studies. [7]
These possibilities are worth reviewing if hair growth is noticed. Simply assuming that red light therapy caused it may distract from a more relevant explanation.
When to Resume Red Light Therapy After Laser Hair Removal or IPL?
There is no established uniform number of hours or days to wait before restarting red light therapy. Skin recovery should take preference over merely following an arbitrary countdown. After a session of LHR or IPL, common side effects include mild redness, swelling around the follicles, warmth or tenderness. Responses may vary according to the device used, treatment area, energy settings and individual sensitivity. [4]
As a practical rule, it is advised to defer another light-based treatment while the skin is still visibly irritated. If the area is blistered, crusted, visibly burned, or the side effects seem more severe than expected, contact your treating clinician before restarting any home device. The American Academy of Dermatology recommends following the treating dermatologist’s aftercare instructions. [4]
How to Balance Skin Recovery With Concerns About Hair Regrowth?
Photodocumentation could help you record your baseline hair status. A few returning hairs and a sustained increase in density are different situations. Take photographs under similar lighting, at a similar interval after shaving, and note when the change began. Consider consulting your dermatologist if you notice an obvious, persistent increase in hair density, particularly on the face or neck.
For now, there is no demonstrated basis for saying that red light therapy brings permanently destroyed follicles back to life. There is also not enough direct evidence to promise that surviving follicles will never respond. Give treated skin time to recover, follow your practitioner’s advice and have a persistent change assessed before attributing it to red light therapy.
What about Bestqool devices?
If you use a Bestqool device, check the specifications and instructions for your particular model. The company offers device customisation, but its product information should not be treated as clinical evidence that red light therapy preserves laser hair-removal results.
A wavelength list alone cannot answer the regrowth question. Evidence from a particular hair-growth device also cannot be transferred automatically to a different panel or treatment routine. For a useful discussion with your practitioner, bring the model name, recommended exposure time and treatment distance.
References
- Perez SM, Vattigunta M, Kelly C, Eber A. Low-Level Laser and LED Therapy in Alopecia: A Systematic Review and Meta-Analysis. Dermatol Surg. 2025 Feb 1;51(2):179-183. doi: 10.1097/DSS.0000000000004442. Epub 2024 Oct 15. PMID: 39404126.
- Mayo Clinic. Laser hair removal [Internet]. Rochester (MN): Mayo Foundation for Medical Education and Research; [cited 2026 Sep 10].
- DermNet. Intense pulsed light therapy [Internet]. DermNet; [cited 2026 Sep 10].
- American Academy of Dermatology. Laser hair removal: FAQs [Internet]. Rosemont (IL): American Academy of Dermatology; [cited 2026 Sep 10].
- Gan SD, Graber EM. Laser hair removal: a review. Dermatol Surg. 2013 Jun;39(6):823-38. doi: 10.1111/dsu.12116. Epub 2013 Jan 17. PMID: 23332016.
- Maghfour J, Ozog DM, Mineroff J, Jagdeo J, Kohli I, Lim HW. Photobiomodulation CME part I: Overview and mechanism of action. J Am Acad Dermatol. 2024 Nov;91(5):793-802. doi: 10.1016/j.jaad.2023.10.073. Epub 2024 Feb 1. PMID: 38309304.
- Snast I, Kaftory R, Lapidoth M, Levi A. Paradoxical Hypertrichosis Associated with Laser and Light Therapy for Hair Removal: A Systematic Review and Meta-analysis. Am J Clin Dermatol. 2021 Sep;22(5):615-624. doi: 10.1007/s40257-021-00611-w. Epub 2021 May 31. PMID: 34057666.
