Just so we have some scientific data backing up some claims the following are studies looking at laser induced hair growth. It seems like a phenomenon that is more common among us darker skin types. Damn, this is really disconcerting.
Hair induction after laser-assisted hair removal and its treatment.
Kontoes P, Vlachos S, Konstantinos M, Anastasia L, Myrto S.
LaserLight Clinic, Athens, Greece. [email protected]
BACKGROUND: Laser hair removal is a relatively safe procedure with limited side effects. Hair induction has been previously scarcely reported. OBJECTIVE: We sought to report the incidence of this strange side effect in a large number of patients treated for hair removal and to follow its course and treatment. METHODS: We conducted retrospective analysis of the files of all patients who underwent laser hair removal during the time period from May 1998 until May 2005 in a private institution in Athens, Greece. RESULTS: Hair induction occurs predominantly on the face and neck of female patients of Mediterranean ancestry with darker skin types. The percentage is quite low (4.5%). Laser treatment of the induced hair reduces the problem. LIMITATIONS: No control groups could be obtained in this study. Furthermore, the natural course of hair induction could not be studied because it was always treated or patients were lost to follow-up. CONCLUSIONS: Hair induction is a rare side effect of laser hair removal occurring in selected populations and body areas; however, it responds well to laser treatments.
Paradoxical hypertrichosis after laser epilation.
Alajlan A, Shapiro J, Rivers JK, MacDonald N, Wiggin J, Lui H.
Division of Dermatology, Vancouver Coastal Health Research Institute, University of British Columbia, Vancouver, British Columbia, Canada.
OBJECTIVE: Hair removal using lasers or broadband intense pulsed light has become one of the most ubiquitous medical procedures. At our center a small proportion of patients have spontaneously reported what they believed to be increased hair growth at sites of previous laser epilation. We sought to retrospectively review the prevalence and features of this paradoxical effect. METHODS: This was a single center, retrospective study that included all patients who underwent laser hair removal during a 4-year period with a long-pulsed alexandrite laser. All cases of laser-induced hypertrichosis were assessed clinically by history, examination, and laboratory tests, and confirmed by review of serial clinical photographs taken during the course of the laser treatments. The clinical features of patients with postlaser hypertrichosis were compared with 50 patients randomly selected from among all those who had undergone laser hair removal at our center (n = 489). RESULTS: Of 489 patients, 3 (0.6%, 95% confidence interval: 0.01-1.9%) treated with the long-pulsed alexandrite laser (755 nm) reported increased hair after laser hair epilation. There was a trend for this adverse effect to occur in darker skin phototypes (IV) and with black hair as compared with the unaffected comparison group (n = 50). However, the small number of cases (n = 3) did not provide sufficient power to adequately test factors such as age, sex, treatment settings, and number of treatments statistically. CONCLUSION: Postlaser hair removal hypertrichosis is a real but rare occurrence in our experience.
Hair growth induced by diode laser treatment.
Bernstein EF.
Laser Surgery and Cosmetic Dermatology Centers, Bryn Mawr, Pennsylvania, USA. [email protected]
BACKGROUND: Although hair reduction by long-pulsed red and infrared lasers and light sources is generally quite effective, paradoxical hair growth has rarely been observed following treatment. OBJECTIVE: To report a case of thick hair growth following 810 nm diode laser treatment and its subsequent treatment. METHODS. A 24-year-old man who had previously had laser hair reduction on his posterior neck was treated to a test area on his upper back. RESULTS: Thick terminal hair developed in the treated area subsequent to laser treatment. Further treatment of this area removed the terminal hair but resulted in terminal hair growth in an annular distribution surrounding the treatment site. CONCLUSIONS: Diode laser treatment rarely stimulates terminal hair growth. This phenomenon should be studied to better understand hair growth cycles and to help develop more effective treatments for hair loss and hair growth.
Pili bigemini and terminal hair growth induced by low-fluence alexandrite laser hair removal.
Bukhari IA.
Dermatology Department, King Faisal University, College of Medicine, Alkhobar, Saudi Arabia. [email protected]
BACKGROUND: Different types of lasers are used in the removal of undesirable hair by targeting the hair follicles, with the melanin pigment acting as the chromophore, and through the mechanism of selective photothermolysis. OBJECTIVES: This report documents an unusual increase in terminal hair growth after alexandrite laser hair removal in three female patients. CONCLUSION: Excessive hair growth after alexandrite laser hair removal must be listed as one of the complications resulting from the use of a laser with a fluence that is too low and can possibly be prevented if we use higher energy to fully destroy the hair follicles, with consideration given to the skin type and an effective cooling system.
PMID: 17241582 [PubMed - in process]
Maybe I should just stay the hell away from lasers altogether.