Patch Testing With Nickel Sulfate 5.0% Traces Significantly More Contact Allergy Than 2.5% : A Prospective Study Within the International Contact Dermatitis Research Group
Background Nickel allergy is the most common contact allergy, and a nickel salt is, therefore, included in most baseline patch test series. In the baseline series of the International Contact Dermatitis Research Group and the American Contact Dermatitis Society, nickel sulfate hexahydrate (NSH) in petrolatum at 2.5% is included, whereas NSH at 5.0% is included in many other baseline series, such a