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.
Dr. Ilyas patel MD