My daughter is 4years old...weight is 17.50kg...she is started having urticaria for 2days...after oneday of having urticaria she started having runny nose...doctor prescribed her atarax syrup...6month back also she had urticaria..this time I did not give her atarax syrup as this time she has less severe hives..I would say much less than before ..will this hives go away on its own..or I will have to give this atarax syrup ...if I need to give that medicine what should be doses and for how many days...?