Thanks for the query,
You might be suffering from shingles
Your description matches with that.
It is a viral infection and you need treatment with anti virals like acyclovir
Also take an antihistamine tablet.
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.