Hi It seems that you are having acute urticaria. There may be some cause. Cause may be irritation, allergic,heat,cold,drugs, trauma, infections ,food, internal diseases,autoimmune,cholinergic.. etc Complete physical examination and Blood tests may be done to find out internal cause or other external cause. If no cause is found, then it is considered idiopathic..i.e. without cause. Antihistaminics and steroids in tappering dose may be helpful. You should consult dermatologist for perfect diagnosis and treatment..ok I hope you got my answer. Thanks. Dr. Ilyas patel MD