title: Split-face study of melasma patients treated with non-ablative fractionated photothermolysis (1540 nm).
abstract: BACKGROUND
  Melasma treatment remains challenging despite various laser systems available, because of potential side-effects and high recurrence rates.
  
  
  OBJECTIVE
  Non-ablative fractionated photothermolysis (FP) is a promising therapeutic method, long-time results comparing treated vs. non-treated site are lacking.
  
  
  METHODS
  A total of 14 patients were treated with FP in a split-face mode with standardized adjustments in three sessions (weeks 0, 3-4, 6-8, follow-up: 26-28). At each consultation, improvement was evaluated by patients and physicians. Objective assessment was performed using digital photographs and the pigment imaging tool SIAscope(®).
  
  
  RESULTS
  Melasma improvement was registered in 83% and 75% of the cases 26-28 weeks after the first treatment based on two evaluations: by patient and by physician, respectively. Digital photography and SIAscope(®) revealed improvement in 54% and 85% after the first, 61% and 85% after the second, 41% and 58% after the third treatment, accordingly, mostly due to reduction of the outline sharpness. Patients with lighter skin complexions revealed significant improvement ranged from slight to moderate (P=0.03). Postinflammatory hyperpigmentation occurred in two cases with skin types III and IV.
  
  
  CONCLUSIONS
  Non-ablative FP can be considered as a valuable treatment option with short-term improvement in terms of mild reduction and softening the edges of melasma in patients with skin types I/II, if prior topical therapies failed. Treatment of patients with skin types III+ should be critically questioned.
authors.affiliation: Department of Dermatology, University Hospital Zurich, Zurich, Switzerland.
authors.forename: M J
authors.initials: MJ
authors.lastname: Barysch
authors.forename: B
authors.initials: B
authors.lastname: Rümmelein
authors.forename: I
authors.initials: I
authors.lastname: Kolm
authors.forename: M B
authors.initials: MB
authors.lastname: Karpova
authors.forename: N
authors.initials: N
authors.lastname: Schönewolf
authors.forename: I
authors.initials: I
authors.lastname: Bogdan Allemann
authors.forename: R
authors.initials: R
authors.lastname: Dummer
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008548:Melanosis / Q000628:therapy*; D008875:Middle Aged; D010789:Phototherapy