Acute urticaria usually short-lived
URTICARIA is one of the easier skin diagnoses to make. The lesions are itchy, annular or arcuate, erupt suddenly and disappear within 6–8 hours, or up to 24 hours maximum.
Individual lesions persisting longer may be an annular erythema or erythema multiforme.
Acute urticaria is commonly from an antibiotic drug reaction, allergy to seafood or nuts or post-viral or bacterial infection. Most cases disappear in a few days but may be up to six weeks in post-viral cases.
Chronic urticaria persists beyond eight weeks. Its causes include autoimmune factors or chronic viral