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BackgroundBeing a contact allergen of general relevance, p‐phenylenediamine (PPD) is patch tested in the baseline series. However, PPD 1% in petrolatum may actively sensitize. Patch testing with PPD at 0.35% pet. proved to be safe, as far as active sensitization is concerned.
ObjectivesTo determine whether PPD 0.3% pet. reliably detects PPD sensitization.
MethodsPatch testing with PPD 0.3% pet....
Background.p‐Phenylenediamine (PPD) 1% in petrolatum has been shown in a prospective study to elicit late reactions in 1.5% of routine patch tests, which may be indicative of patch test sensitization.
Objectives.
To assess the frequency of late reactions to reduced PPD patch test concentrations.
Methods.
In 1838 patients, PPD was tested at three concentrations (0.5% pet., group I; 0.4% pet., group...
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