It seems that you are having Acute urticaria
There may be wheals and erythema
There are many causes of acute urticaria.
Irritation, allergy,pressure,heat cold,water,cholinergic,worms,infection,drugs,internal disease, autoimmune,connective tissue
You consult dermatologist
Proper history and investigations are needed.
You may be investigated to find out the cause.
There may be no cause.. idiopathic.
Anti histaminics and steroids in tappering dose will improve.
There may be relapse.
Repeat treatment may be taken.
I hope you got my answer.
Dr.Ilyas Patel MD