Hives in children
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Overview of Hives (Urticaria) in Children
Hives, also known as urticaria, are a common skin condition in children, characterized by raised, itchy, red welts or plaques that often appear suddenly and can move around the body. These lesions are usually very itchy and may be accompanied by angioedema, which is swelling in deeper layers of the skin. Hives can be classified as acute if they last less than six weeks, or chronic if they persist longer than six weeks 1279+1 MORE.
Causes and Triggers of Hives in Children
Acute Urticaria Triggers
Acute urticaria is much more common in children than chronic urticaria. The most frequent triggers for acute hives in children include infections (especially viral), medications, and foods. Infections are particularly common causes in infants and young children, accounting for more than 40% of cases. Sometimes, no specific cause can be identified 1279.
Chronic Urticaria and Its Etiology
Chronic urticaria is less common in children and is often classified as chronic spontaneous urticaria (CSU) when no clear trigger is found. In many cases, the cause remains unknown, and the condition is termed idiopathic. Autoimmune mechanisms are thought to play a role in at least 30% of children with chronic urticaria. Other rare causes include physical triggers (such as cold or pressure), and, in some cases, chronic infections or parasitic infestations, especially in children who have immigrated from regions where such infections are more common 3567+1 MORE.
Clinical Features and Diagnosis
Hives in children typically present as well-defined, raised, red or pale plaques that are very itchy and often resolve within 24 hours. Angioedema may occur alongside hives in about 40% of cases. It is important to distinguish hives from other skin conditions that may look similar, such as erythema multiforme or urticarial vasculitis. Urticarial vasculitis should be suspected if the lesions are painful, last more than 48 hours, leave marks, or are associated with systemic symptoms like fever or joint pain 1249+1 MORE.
Evaluation and Management
Identifying the Cause
A thorough medical history is key to identifying potential triggers, especially in acute urticaria. Laboratory tests are usually not needed unless the history suggests a specific underlying cause or if the hives are chronic and not responding to standard treatments. Routine allergy testing for foods or environmental allergens is not recommended in chronic urticaria, as it rarely identifies a cause and may lead to unnecessary dietary restrictions 279.
Treatment Approaches
Most cases of acute urticaria in children resolve on their own within days. Antihistamines are the mainstay of treatment to relieve itching and discomfort. In more severe cases, or if there is angioedema or difficulty breathing, emergency treatment with epinephrine and corticosteroids may be needed. Chronic urticaria is managed with regular antihistamines, and sometimes additional medications if symptoms are not controlled 248.
Prognosis and Natural History
Acute hives in children are usually self-limiting and resolve quickly. Chronic urticaria can persist for months or even years, but about 10% of children experience resolution each year. Certain laboratory markers, such as a positive basophil activation test (BAT), may predict a higher chance of early resolution, while the presence of basophils may be associated with a longer disease course 56.
Special Considerations and Differential Diagnosis
Because hives can be a symptom of other underlying conditions, it is important for clinicians to consider a broad range of possible diagnoses, especially if the child has other symptoms like fever, joint pain, or unusual skin findings. Conditions that can mimic hives include serum sickness-like reactions, urticarial vasculitis, and various autoinflammatory syndromes 4910.
Conclusion
Hives are a frequent and usually benign condition in children, most often triggered by infections, foods, or medications. Acute urticaria is much more common than chronic urticaria in this age group. Most cases resolve quickly with simple treatments like antihistamines. Chronic urticaria is less common, often has no identifiable cause, and may require longer-term management. A careful clinical approach helps ensure accurate diagnosis and effective treatment, while avoiding unnecessary tests and interventions.
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