Allergic contact dermatitis from corticosteroids: reproducibility of patch testing and correlation with intradermal...

Area of Science:

• Dermatology
• Allergology
• Contact Dermatitis

Background:

• Corticosteroid contact allergy is a recognized clinical issue.
• Diagnosis relies on patch testing or intradermal (ID) testing.
• Patch testing has historically faced challenges with reproducibility.

Purpose of the Study:

• Evaluate patch testing reproducibility and clinical relevance for topical steroids.
• Correlate patch test results with intradermal (ID) testing outcomes.
• Investigate cross-reactivity among different corticosteroid groups.
• Identify reactions to preservatives and vehicles in topical steroid formulations.

Main Methods:

• 19 patients with prior positive steroid patch tests were evaluated.
• Exclusion criteria included atopy and type I hypersensitivity.
• Patch testing included steroid series, commercial products, vehicles, and preservatives.
• Intradermal (ID) testing was performed on patients and 9 controls.
• Readings were assessed on days 2, 5, and 7.

Main Results:

• Tixocortol-21-pivalate was the most frequent steroid allergen (68%).
• Patch test reproducibility for topical steroids ranged from 66% to 100%.
• 89% of patients showed reactions to either patch or ID testing.
• Formaldehyde and its releasers were common causes of reactions to vehicles/preservatives.

Conclusions:

• Patch testing is adequate for diagnosing allergic contact dermatitis to topical steroids.
• Commercial steroid products are not effective for screening steroid allergies.
• Common cross-reactions occur between Group A and Group D2 corticosteroids.