Approach to Children with Hives.

Area of Science:

• Dermatology
• Allergy and Immunology

Background:

• Urticaria (hives) is a pruritic, erythematous skin rash, often accompanied by angioedema.
• Acute urticaria is common in children, while chronic urticaria (hives > 6 weeks) is rare and often idiopathic.
• Urticarial vasculitis presents with distinct features and requires specific diagnostic considerations.

Purpose of the Study:

• To differentiate between acute and chronic urticaria.
• To guide diagnostic approaches for urticaria, emphasizing appropriate testing.
• To identify conditions that mimic urticaria, such as urticarial vasculitis.

Main Methods:

• Review of clinical presentation and diagnostic criteria for urticaria.
• Discussion of etiological factors in acute urticaria.
• Guidance on the judicious use of allergy testing and skin biopsy.

Main Results:

• Causes of acute urticaria are often identifiable through medical history and targeted lab evaluation.
• Chronic urticaria is frequently idiopathic, and universal allergy testing is generally unhelpful and can yield false positives.
• Urticarial vasculitis should be suspected in persistent, painful lesions with scarring or systemic symptoms, warranting a skin biopsy.

Conclusions:

• Accurate diagnosis of urticaria relies on differentiating acute from chronic forms and considering underlying causes.
• Avoidance of non-specific allergy testing in chronic urticaria is crucial to prevent unnecessary dietary or allergen restrictions.
• Urticarial vasculitis requires prompt recognition and biopsy for definitive diagnosis and management.