Infectious pseudochromhidrosis is a rare dermatological disorder, characterized by a change in colour of the sweat from normal skin, caused by pigments from microorganisms. Such pigments are a result of evolutionary competition among microorganisms, which appears to be a decisive factor in their survival, pathogenicity, and virulence. Four bacteria are known to be involved in infectious pseudochromhidrosis:
Bacillus
spp. (blue colour),
Corynebacterium
spp. (brown/black colour),
Serratia marcescens
(red/pink colour), and
Pseudomonas aeruginosa
(blue-green colour). Infectious pseudochromhidrosis seems to be triggered by certain drugs and conditions causing physiological alterations and/or changes in microflora on the skin surface. The condition can be treated by addressing potential triggers and/or prescribing antibiotic/antiseptic therapies. We report here a case of blue infectious pseudochromhidrosis caused by pigment-producing Bacillus cereus and the results of a literature review.