Contact dermatitis due to sodium colistimethate.

Colistin methanesulfonate sodium (CLMS) is a widely-used antibiotic. To our best knowledge, only two cases of contact allergy to CLMS have been reported. We described a 4-year-old girl with contact dermatitis evoked by CLMS that had been applied as an ophthalmic solution. The dermatitis started after administration for 21 days. The diagnosis was confirmed by as is and constituent patch tests. We reviewed the literature in which contact allergy due to CLMS and colistin sulfate is described.