Positive patch-test reactions to iodopropynyl butylcarbamate: retrospective analysis of North American contact dermatitis group data, from 1998 to 2008.

Background: iodopropynyl butylcarbamate (IPBC), a commonly used preservative, is found in industrial and personal care products.

Objective: to evaluate prevalence, clinical relevance, occupational relationship, and sources of positive reactions to IPBC in patients in North America.

Methods: the North American Contact Dermatitis Group (NACDG) tested IPBC 0.