Here are the top five contact allergens that are missed using the standing 28-allergen screening tray (T.R.U.E. Test), according to Dr. Donald V. Belsito, who presented the top 25 at the annual meeting of the American Contact Dermatitist Society in San Diego. The results are based on a retrospective analysis including 2,088 patients who were patch tested from 1995-2010.
4.) Propylene glycol
5.) DMDM hydantoin (1,3-Bis(hydroxymethyl)-5,5-dimethylimidazolidine-2,4-dione)