Infant hives
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Infant Hives: Causes, Symptoms, and Insights
Cold-Induced Urticaria in Infants
Cold-induced urticaria is a condition where exposure to cold triggers hives or urticarial lesions. A case study describes a 3-month-old infant who developed generalized urticarial lesions after being immersed in an outdoor swimming pool. The hives disappeared within 30 minutes without any other symptoms like joint swelling, fever, or irritability. Similar episodes occurred at 6 months of age, again associated with cold water exposure . This suggests that cold-induced urticaria can manifest early in infancy and is typically transient and self-resolving.
Chronic Urticaria and Histamine-Independent Mechanisms
Chronic urticaria is defined as hives persisting for more than six weeks and can affect a small percentage of the population. In infants, chronic urticaria can be part of a spectrum of hereditary periodic fever disorders known as cryopyrin-associated periodic syndrome (CAPS). CAPS includes conditions like familial cold autoinflammatory syndrome and Muckle-Wells syndrome, which are characterized by periodic attacks of urticarial rash, fever, and arthralgia. The most severe form, chronic infantile neurological cutaneous and articular syndrome, includes chronic urticaria along with other severe symptoms such as fever, arthropathy, and chronic meningitis .
Interestingly, while histamine release from mast cells is a common cause of urticaria, a significant number of chronic urticaria cases in infants are mediated through histamine-independent mechanisms. This is evidenced by the fact that only about 55% of patients with chronic urticaria respond to antihistamines, indicating other underlying inflammatory pathways .
Conclusion
Infant hives can be triggered by various factors, including cold exposure and underlying genetic conditions. Cold-induced urticaria is typically transient and resolves quickly without additional symptoms. Chronic urticaria in infants can be part of more complex syndromes like CAPS, which involve multiple systemic symptoms. Understanding the underlying mechanisms, whether histamine-dependent or independent, is crucial for effective management and treatment of urticaria in infants.
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