title: High-strength tretinoin for rapid retinization of photoaged facial skin.
abstract: BACKGROUND
  Emollient creams of 0.02% and 0.05% tretinoin are currently used for improving the appearance of photoaged skin. At these concentrations, using this vehicle, the clinical results take many months.
  
  
  OBJECTIVE
  The objective was to formulate and test a higher strength tretinoin that enhances penetration of the active molecule through the stratum corneum so that the clinical result is achieved after 1 month of treatment.
  
  
  METHODS
  Thirty-two female subjects underwent treatment with 0.25% tretinoin solution applied nightly for 1 month. Subjects were evaluated clinically at baseline and 1, 2, and 4 weeks. Clinical grading was performed by comparing digital photographs before and after treatment.
  
  
  RESULTS
  Almost all subjects improved on all measures of clinical grading (fine lines, mottled pigmentation, surface texture/roughness) by the end of the study.
  
  
  CONCLUSIONS
  Tretinoin solution at a concentration of 0.25% is an effective and tolerable treatment for photodamaged facial skin and greatly shortens the time required for clinical response.
authors.affiliation: SKIN, Inc., Conshohocken, Pennsylvania, USA. skininc1@aol.com
authors.forename: Douglas E
authors.initials: DE
authors.lastname: Kligman
authors.forename: Zoe Diana
authors.initials: ZD
authors.lastname: Draelos
mesh_terms: D000279:Administration, Cutaneous; D000328:Adult; D004334:Drug Administration Schedule; D005148:Facial Dermatoses / Q000188:drug therapy* / Q000473:pathology; D005260:Female; D006801:Humans; D007641:Keratolytic Agents / Q000008:administration & dosage / Q000627:therapeutic use*; D008875:Middle Aged; D015595:Skin Aging / Q000473:pathology*; D016896:Treatment Outcome; D014212:Tretinoin / Q000008:administration & dosage / Q000627:therapeutic use*
chemical_list: D007641:Keratolytic Agents; D014212:Tretinoin