Urticaria (Hives)
Urticaria, or hives, is a temporary skin rash characterized by itchy welts that resolve within 24 hours, though new lesions may continue appearing over weeks or months.
Overview
Urticaria is the medical term for hives, a common skin rash which presents with itchy pink welts. The welts can differ in size, shape, and distribution. A key feature is that individual lesions are temporary, appearing and resolving within a 24 hour period. Although someone may experience hives for weeks or months, each welt disappears within one day before new ones develop.
Classification and Causes
Urticaria divides into two types, acute (under 6 weeks) and chronic (over 6 weeks). Acute urticaria is commonly caused by infections, foods, medications, or insect stings and bites. Chronic urticaria is typically idiopathic, meaning the underlying cause remains unknown.
Triggers
In some people, certain physical stimuli such as heat, cold, exercise, sun exposure, or pressure can induce hives.
Treatment
Treatments include avoiding triggers and/or allergens and the use of antihistamines (either over the counter or by prescription). For difficult or persistent cases, oral prednisone and immune-modulating medications may be prescribed.
This information is educational and not a substitute for professional medical advice, our board-certified dermatologists can evaluate and treat your specific concern.
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