title: Hair growth induced by diode laser treatment.
abstract: 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.
authors.affiliation: Laser Surgery and Cosmetic Dermatology Centers, Bryn Mawr, Pennsylvania, USA. dermguy@hotmail.com
authors.forename: Eric F
authors.initials: EF
authors.lastname: Bernstein
mesh_terms: D000328:Adult; D018859:Hair Follicle / Q000528:radiation effects*; D006204:Hair Removal / Q000009:adverse effects*; D006628:Hirsutism / Q000473:pathology / Q000532:radiotherapy*; D006801:Humans; D028022:Low-Level Light Therapy / Q000009:adverse effects*; D008297:Male; D009333:Neck / Q000473:pathology