Welcome to HCM.
With your history , it seems that you are having HERPES ZOSTER
It is a viral infection caused by VZV virus...
The disease is also called shingle.
There is perfect treatment.
Take antiviral tablet like acyclovir in proper dose.
Pain killer like ketorolac may be taken.
Local application of silver sulfadiazine
improves the disease.
Steroids in tappering dose would be helpful to prevent post herpetic neuralgia
You immediately consult dermatologist
and have treatment.
I hope you got my answer.
Dr. Ilyas Patel MD