Methylisothiazolinone, a preservative found in face cleansers, shampoos, moisturizers, body washes and baby wipes, may be causing a rise in cases of contact dermatitis, dermatologists say. Manufacturers previously used the chemical in a 3-to-1 ration with methylchloroisothiazolinone, but concerns that MCI caused allergies led some to switch formulations and use MI alone in much higher concentrations. The British Association of Dermatologists will ask health officials to re-evaluate safe levels of the preservative.

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