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Precision Implementation of Minimal Erythema Dose (MED) Testing to Assess Individual Variation in Human Inflammatory Response

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Multicentre patch testing with a resol resin based on phenol and formaldehyde.

Marléne Isaksson¹, Annica Inerot, Carola Lidén

¹Department of Occupational and Environmental Dermatology, Skåne University Hospital, Lund University, SE-205 02 Malmö, Sweden. marlene.isaksson@skane.se

Contact Dermatitis

|May 21, 2011

Summary

This summary is machine-generated.

Contact allergy to phenol-formaldehyde resins (PFRs) is detected by PFR-2, with 1.1% of patients showing reactions. This finding supports including PFR-2 in baseline patch testing for better allergy detection.

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Area of Science:

Dermatology
Allergology
Toxicology

Background:

Contact allergy to phenol-formaldehyde resins (PFRs) is often missed by standard patch tests using p-tertiary-butylphenol-formaldehyde resin (PTBP-FR).
Phenol and formaldehyde are key components of PFRs, implicated in allergic contact dermatitis.

Purpose of the Study:

To determine the prevalence of contact allergy to PFR-2 (a specific phenol-formaldehyde resin mixture) in a Swedish population.
To identify simultaneous allergic reactions associated with PFR-2 allergy.

Main Methods:

A prospective study involving 2504 patients across five centers in the Swedish Contact Dermatitis Research Group.
PFR-2 was incorporated into the baseline patch test series for 1.5 years.

Main Results:

A contact allergy rate of 1.1% (27 out of 2504 patients) was observed for PFR-2.
Two patients reacted to formaldehyde and two to PTBP-FR among those with PFR-2 allergy.
Simultaneous allergies were noted to colophonium (6 patients), Myroxylon pereirae (14 patients), and fragrance mix I (15 patients).

Conclusions:

The 1.1% contact allergy frequency to PFR-2 justifies its inclusion in the Swedish baseline patch test series.
Consideration for inclusion in other international baseline series is recommended.
Associated allergies to colophonium, Myroxylon pereirae, and fragrance mix I highlight potential cross-reactivity or co-sensitization patterns.