Hypersensitivity Reaction to Detergents - A Myth or Reality?

Area of Science:

• Dermatology
• Allergology
• Contact Dermatitis Research

Background:

• Contact allergic dermatitis (CAD) and urticaria are common allergic skin conditions.
• Patients often suspect laundry detergents, but scientific evidence linking them is scarce.
• Common allergens include nickel, chromium, and fragrances, but their presence in detergents doesn't guarantee causation.

Purpose of the Study:

• To investigate the actual role of laundry detergents as a cause of contact allergic dermatitis (CAD).
• To evaluate the clinical significance of detergent ingredients and residues on clothing.
• To determine the necessity of patch testing for suspected detergent-induced skin reactions.

Main Methods:

• Review of existing studies on patient-reported suspected laundry detergent allergies.
• Analysis of patch test data for common allergens found in detergents.
• Inclusion of studies involving direct patient testing with diluted detergents and detergent-washed clothing.

Main Results:

• Less than 0.7% of patients with suspected CAD were found to have it caused by laundry detergent.
• Residual detergent concentrations on washed clothes were not clinically significant, even for sensitive skin.
• Positive patch tests for common allergens (nickel, chromium, fragrance) did not correlate with detergent allergy.

Conclusions:

• Laundry detergents are an infrequent cause of CAD and urticaria.
• The concentration of allergens in detergents and their residues on clothing is generally too low to trigger reactions.
• Patch testing with detergents may be considered for localized rashes, but clothing materials are more likely culprits.