title: Recall Dermatitis to Metronidazole.
abstract: OBJECTIVE
  Recall dermatitis is an uncommon entity that has been noted with patch testing, repeat exposures to a medication or allergen, and the concurrent use of ultraviolet radiation and certain medications. Recall dermatitis from primary cutaneous exposure and subsequent oral exposure are rare, and the etiology remains unknown.
  
  
  CONCLUSIONS
  We report a case of recall dermatitis with a drug eruption secondary to metronidazole. Therapy with this medication was initially topical for rosacea and subsequently oral for a gastrointestinal infection. This case draws attention to the use of metronidazole and the risk of recall dermatitis.
authors.affiliation: Division of Dermatology, University of Toronto, and Department of Occupational and Environmental Health, St. Michael's Hospital, Toronto, ON farheen.mussani@utoronto.ca.
authors.forename: Farheen
authors.initials: F
authors.lastname: Mussani
authors.affiliation: Division of Dermatology, University of Toronto, and Department of Occupational and Environmental Health, St. Michael's Hospital, Toronto, ON.
authors.forename: Sandy
authors.initials: S
authors.lastname: Skotnicki
mesh_terms: D003875:Drug Eruptions / Q000209:etiology*; D005260:Female; D006801:Humans; D008795:Metronidazole / Q000009:adverse effects* / Q000627:therapeutic use; D008875:Middle Aged; D012393:Rosacea / Q000188:drug therapy
chemical_list: D008795:Metronidazole