It is difficult to determine the time for the complete elimination of acute urticaria in children, but timely and effective treatment measures can shorten the time for urticaria to subside, and it can usually be completely eliminated within a few hours, or it may last for a few days, or even a dozen days. Pediatric acute urticaria is a skin disease induced by allergens entering the body, and is mainly manifested in the clinic as temporary, limited and raised erythema. If the allergen is removed in time and anti-allergy medication is given, the symptoms of pediatric acute urticaria can be relieved quickly, and in this case the urticaria will subside in a few hours or so. If the allergen persists, the symptoms of urticaria will recur or persist, and the time for complete elimination in this case can be a few days or longer, and it is difficult to determine the exact time of elimination. Due to the differences in clinical manifestations of the disease and individual differences in medication, the specific situation needs to be analyzed by a doctor based on the results of the treatment.