Contact Allergens Associated With Nummular Eczema: A Systematic Review.

In 30 seconds

This systematic review examined the association between contact allergens and nummular eczema (NE) by analyzing 10 observational studies. The median patch test positivity among NE patients was 47.8%, indicating a significant prevalence of contact allergen sensitization. The review highlights common allergens such as nickel and fragrance mix, suggesting the need for patch testing in severe cases.

Key findings

• The median overall patch test positivity among NE patients was 47.8% (range: 26.7% to 56.0%).
• A median of 33.5% of NE patients had concurrent or prior allergic contact dermatitis.
• Common allergens included nickel, potassium dichromate, and fragrance mix.

Why it matters

Understanding the role of contact allergens in nummular eczema can help clinicians identify potential triggers and improve management strategies for patients, particularly those with severe or treatment-resistant forms of the condition.