title: [Right-sided laptop dermatitis].
abstract: METHODS
  A 44-year-old man presented at a dermatologist with a 2 months history of a blue-brown reticular macule on the right thigh that had appeared spontaneously. It was neither painful nor itching and showed no growth or further colour change.
  
  
  METHODS
  Punch biopsy, antinuclear antibodies, CrP, immune electrophoresis, hepatitis serology, urine diagnostics showed normal results.
  
  
  METHODS
  On specific inquiry the patient, a long-distance truck driver, reported to rest his laptop during driving breaks always on the right thigh. We diagnosed a "laptop dermatitis".
  
  
  CONCLUSIONS
  Consider external mechanical or thermal triggers if skin changes are unilateral. Thermal isolation from permanent heat exposure prevents an erythema ab igne reliably.
authors.affiliation: Friedrich-Schiller-Universität Jena, Klinik für Hautkrankheiten.
authors.forename: Claudia
authors.initials: C
authors.lastname: Schummer
authors.affiliation: Friedrich-Schiller-Universität Jena, Klinik für Hautkrankheiten.
authors.forename: Jörg
authors.initials: J
authors.lastname: Tittelbach
authors.affiliation: Friedrich-Schiller-Universität Jena, Klinik für Hautkrankheiten.
authors.forename: Peter
authors.initials: P
authors.lastname: Elsner
mesh_terms: D000328:Adult; D003872:Dermatitis / Q000209:etiology / Q000473:pathology; D006801:Humans; D008297:Male; D008838:Microcomputers