Background: Sensitivity to methylchloroisothiazolinone (MCI)/methylisothiazolinone (MI) has increased rapidly over recent years. This increase is mainly related to the extensive use of high concentrations of MI in cosmetic products, although a growing number of cases of occupational allergic contact dermatitis are caused by MCI/MI.
Objective: The aim of this study was to examine the association between the increase in MCI/MI sensitization and the work performed by the patients in our area.