title: Seasonal variations in the severity of acne vulgaris.
abstract: OBJECTIVE
  The improvement of acne in summertime or the aggravation of acne in winter is a traditional dermatologic opinion. Ultraviolet rays are thought to be beneficial in the treatment of acne. In the existing literature there is no proof of this. The purpose of this study was to find out whether or not acne generally worsens in winter.
  
  
  METHODS
  One hundred and thirty-nine patients were asked if their acne worsens in winter or in summertime, whether it improves seasonally, or if they didn't notice any change with the seasons.
  
  
  RESULTS
  About one-third of the patients reported an aggravation of their acne in winter, but also approximately one-third of the patients complained about an aggravation of their acne in summer. Another third did not notice any change.
  
  
  CONCLUSIONS
  Sun-bathing may be beneficial for psychologic reasons and may produce euphoric effects, but we do not see any reason to treat acne with ultraviolet radiation because of all its negative effects on the skin.
authors.affiliation: Department of Dermatology, Technical University Munich, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Gfesser
authors.forename: W I
authors.initials: WI
authors.lastname: Worret
mesh_terms: D000152:Acne Vulgaris / Q000145:classification / Q000503:physiopathology*; D000293:Adolescent; D000328:Adult; D005260:Female; D006370:Heliotherapy / Q000523:psychology; D006801:Humans; D007407:Interviews as Topic; D008297:Male; D012621:Seasons; D012737:Sex Factors; D013546:Sweating; D014466:Ultraviolet Rays; D014467:Ultraviolet Therapy