Thank you for query.If the diagnosis is proved as urticaria.it may be due to allergies to any food products, or due to any infection/disease in the body like simple dental or worm infections etc .You need antihistamines like levocetrizine in morning and Hydroxyzine in the night.Maintain diary of foods consumed,other significant substance likely to cause allergies,to get an idea of possible allergies.You have to avoid them.You can go for patch test to find agent if you desire.Consult dermatologist if persists for investigation.