title: Low dose isotretinoin combined with tretinoin is effective to correct abnormalities of acne.
abstract: BACKGROUND
  Isotretinoin is well known in the therapy of acne papulopustulosa and acne conglobata. No study has investigated the pathophysiological changes of the skin of acne patients, especially when low dose oral isotretinoin is given in combination with topical tretinoin.
  
  
  METHODS
  28 patients were treated for 6 months with oral isotretinoin. In the acne conglobata group (A-C) patients were treated with 10 mg (Group A) or 20 mg isotretinoin (Groups B, C) in combination with topical 0.05% tretinoin cream. Group C was treated the first 2 weeks with 0.05% betamethasone valerate cream instead of tretinoin cream. In the acne papulopustulosa group, the patients received 0.5 mg isotretinoin/kg bodyweight and 0.05% tretinoin cream, either alone (Group E), or with oral methylprednisolone during induction (Group D).
  
  
  RESULTS
  Acne conglobata--A reduction of inflammatory lesion by 87-94% and of non-inflammatory lesions by 81-88% was achieved (Groups A-C). A reduction of sebaceous gland size by 35-58%, sebum production by 90-95%, follicular keratinization by 55-70% and Propionibacteria by 33-73% was seen (Groups B and C better than Group A). In Group A the amount of lipids was only reduced by 6%, in Group B by 35% and in Group C by 40%. Acne papulopustulosa--Sebum excretion rate and follicular keratinization were reduced in Group D by 89% and 50% respectively, with isotretinoin alone by 94% and 53%. The amount of lipids was reduced in Group D by 40% and in Group E by 21%.
  
  
  CONCLUSIONS
  Because of the efficacy and cost-benefit relationship of isotretinoin in the treatment of acne compared to other therapeutic approaches, further use low dose isotretinoin in the described settings seems to justified.
authors.affiliation: Department of Dermatology and Allergology, Ludwig-Maximilian-University Munich, Germany. Gerd.Plewig@derma.med.uni-muenchen.de
authors.forename: Gerd
authors.initials: G
authors.lastname: Plewig
authors.forename: Heidrun
authors.initials: H
authors.lastname: Dressel
authors.forename: Maike
authors.initials: M
authors.lastname: Pfleger
authors.forename: Silke
authors.initials: S
authors.lastname: Michelsen
authors.forename: Albert M
authors.initials: AM
authors.lastname: Kligman
mesh_terms: D000152:Acne Vulgaris / Q000175:diagnosis* / Q000188:drug therapy*; D000284:Administration, Oral; D000287:Administration, Topical; D000293:Adolescent; D000328:Adult; D003879:Dermatologic Agents / Q000008:administration & dosage; D004334:Drug Administration Schedule; D004338:Drug Combinations; D005260:Female; D006801:Humans; D015474:Isotretinoin / Q000008:administration & dosage*; D008297:Male; D012720:Severity of Illness Index; D012867:Skin / Q000187:drug effects*; D016896:Treatment Outcome; D014212:Tretinoin / Q000008:administration & dosage*
chemical_list: D003879:Dermatologic Agents; D004338:Drug Combinations; D014212:Tretinoin; D015474:Isotretinoin