title: Treatment of common warts and actinic keratoses by Er:YAG laser.
abstract: OBJECTIVE
  The use of ablative lasers in the treatment of common warts and precancerous actinic keratoses has been reported in the literature, showing variable response rates and relapse rates. The erbium:YAG laser (Er:YAG) with a wavelength of 2.94 microm allows precise ablation avoiding strong inflammation. The authors have evaluated the potential benefits of Er:YAG laser treatment for difficult-to-treat warts and actinic keratoses.
  
  
  METHODS
  A total of 69 patients with difficult-to-treat warts (periungual or plantar) with a mean age of 30.1 +/- 16.1 years (range 11-58 years), and 29 patients with actinic keratoses with a mean age of 73.5 +/- 9.7 years (range 58-90 years) were treated by Er:YAG laser. Ablative therapy was performed with a spot size of 3 mm, a frequency between 8 Hz and 15 Hz, and a fluence of 5.7-11.3 J cm(-2) (warts) or 5.7-7.1 J cm(-2) (actinic keratoses).
  
  
  RESULTS
  After a single laser treatment a complete response (CR) was observed in 50 patients with warts (72.5%). Plantar warts were more resistant (13.5% non-responder) compared with periungual warts (5.9% non-responder). Twelve patients with a CR showed a relapse within 3 months after treatment (24.0%). All but one suffered from plantar warts. Twenty-six patients with actinic keratoses showed a CR after a single laser treatment, and in three patients a partial response (PR) was achieved. None of the patients treated with Er:YAG laser developed pigment changes, wound infections or scarring.
  
  
  CONCLUSIONS
  Treatment of common epithelial lesions such as common warts or actinic keratoses by Er:YAG laser is safe and effective. In patients with plantar warts, however, a significant rate of relapse may occur, requiring additional therapy.
authors.affiliation: Department of Dermatology and Allergology, Friedrich Schiller University of Jena, Jena, Germany. wollinauw@khdf.de
authors.forename: U
authors.initials: U
authors.lastname: Wollina
authors.forename: H
authors.initials: H
authors.lastname: Konrad
authors.forename: T
authors.initials: T
authors.lastname: Karamfilov
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007642:Keratosis / Q000175:diagnosis / Q000628:therapy*; D053685:Laser Therapy; D008875:Middle Aged; D009354:Neodymium; D012720:Severity of Illness Index; D012871:Skin Diseases / Q000175:diagnosis / Q000628:therapy*; D016896:Treatment Outcome; D014860:Warts / Q000175:diagnosis / Q000601:surgery*
chemical_list: D009354:Neodymium