Thanks for the query,
You might be suffering from a condition called as urticaria
It is an allergic condition.
There must be a particular food or any other item with which you are getting this allergy
Even a new cloth or change in environment can cause this.
Try to notice it and eliminate it.
Treatment is with anti histamines
might be required if it is severe.
This will give you some relief.
Please meet a dermatologist
for exact diagnosis.
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.
Wishing you a good health.