Patch testing for food-associated allergies in orofacial granulomatosis

Area of Science:

• Dermatology
• Allergology
• Clinical Immunology

Background:

• Orofacial granulomatosis (OFG) is often linked to food allergies, especially to benzoates and cinnamon-related compounds.
• Standard and urticarial patch testing are diagnostic methods for these allergies.
• Elimination diets can be effective for managing OFG.

Purpose of the Study:

• To compare the diagnostic efficacy of standard versus urticarial patch testing in patients with orofacial granulomatosis.
• To evaluate the detection rates of specific food allergens like benzoates and cinnamon compounds.

Main Methods:

• A retrospective analysis of 120 orofacial granulomatosis patient records from two hospitals.
• Examination of detailed patch test results, comparing standard and urticarial methods.
• Assessment of reaction times for positive urticarial tests.

Main Results:

• Urticarial patch testing detected allergies to benzoates and cinnamon compounds in 55% of patients, significantly higher than standard patch testing (7%).
• All positive urticarial patch tests showed reactions within 60 minutes.
• Standard patch testing showed limited utility for these specific food allergies.

Conclusions:

• Both standard and urticarial patch testing are necessary for comprehensive food allergy diagnosis in OFG.
• Urticarial patch testing, with professional reading at 60 minutes, offers a reliable method for detecting food allergies.
• This approach can mitigate challenges associated with patient self-reporting of test results.