Thanks for the query.
You have developed an acute urticaria
It is said that anything in this world can cause urticaria.
It can be a cloth, medication, water, sunlight almost anything.
You need to look for the cause,
Please take anti histamine
tablets like cetrizine
This will give you relief.
In severe cases even oral steroids may be required.
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.