[Interest of allergy tests in urticaria]

Area of Science:

• Dermatology
• Allergology
• Immunology

Background:

• Urticaria affects 20% of the population, presenting as acute or chronic forms.
• Clinical diagnosis is straightforward due to characteristic rash, but identifying causes and effective treatments poses challenges.
• While chronic urticaria is generally benign, acute urticaria can be dangerous if associated with allergies.

Purpose of the Study:

• To differentiate the diagnostic and management approaches for acute versus chronic urticaria.
• To highlight the importance of allergy assessment in specific urticaria cases.
• To define the risks associated with allergic reactions in acute urticaria.

Main Methods:

• Review of clinical presentation and diagnostic considerations for urticaria.
• Evaluation of the role of allergy testing (skin tests, specific IgE assays) in urticaria management.
• Risk assessment for anaphylaxis in acute urticarial episodes.

Main Results:

• Allergy is uncommon in chronic urticaria, thus routine allergy testing is not advised.
• Acute urticaria with suspected IgE-mediated reactions warrants allergy investigation.
• Prompt allergy assessment in acute urticaria is crucial due to the risk of severe anaphylaxis upon re-exposure.

Conclusions:

• Management strategies for urticaria should be tailored based on whether it is acute or chronic.
• Allergy testing is indicated for acute urticaria with clinical suspicion of an allergic trigger.
• Early identification and management of allergy in acute urticaria are vital for preventing severe allergic reactions.