The kind of itching you are describing is difficult to comment upon this way.
However, do you have any fever, rash?
Do you have any red colour rash/papule?
Do you have pain?
This can also be herpes zoster
, it has painful rash
Some times this kind of itching starts and then later rash appears.
It can be a fungal infection
If you have chest pain
which you are describing as itch, get your ECG done o be sure.
Review with us with your answers.
Happy to help you
Dr Anshul, M.D.