title: Pseudochromhidrosis: blue discolouration of the head and neck.
abstract: A 57-year-old man is presented with blue pseudochromhidrosis affecting the face and neck following combination treatment with lansoprazole, a proton pump inhibitor, and ranitidine, a type two histamine receptor antagonist. The diagnosis was made on the basis of clinico-histological features and growth of Malassezia furfur, and Bacillus species, not Bacillus cereus, in the absence of lipofuscin. The pseudochromhidrosis resolved on stopping both medications and did not recur on restarting only the proton pump inhibitor.
authors.affiliation: Department of Dermatology, Waikato Hospital, Hamilton, New Zealand. sarahhillnz@gmail.com
authors.forename: Sarah
authors.initials: S
authors.lastname: Hill
authors.forename: Mark
authors.initials: M
authors.lastname: Duffill
authors.forename: Duncan
authors.initials: D
authors.lastname: Lamont
authors.forename: Marius
authors.initials: M
authors.lastname: Rademaker
authors.forename: Anthony
authors.initials: A
authors.lastname: Yung
mesh_terms: D053799:2-Pyridinylmethylsulfinylbenzimidazoles / Q000494:pharmacology; D001407:Bacillus / Q000187:drug effects / Q000302:isolation & purification; D005148:Facial Dermatoses / Q000473:pathology*; D005765:Gastrointestinal Agents / Q000494:pharmacology; D006801:Humans; D064747:Lansoprazole; D008290:Malassezia / Q000187:drug effects / Q000302:isolation & purification; D008297:Male; D008875:Middle Aged; D010860:Pigments, Biological; D011899:Ranitidine / Q000494:pharmacology; D012536:Scalp Dermatoses / Q000473:pathology*; D012867:Skin / Q000382:microbiology / Q000473:pathology*; D013543:Sweat Gland Diseases / Q000382:microbiology / Q000473:pathology*
chemical_list: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D005765:Gastrointestinal Agents; D010860:Pigments, Biological; D064747:Lansoprazole; D011899:Ranitidine