Antivirals will cure the rash
I have carefully read through your query and understand your concern,
As per your clinical history and uploaded image ,it is most likely to be a viral induced rash called "POST HERPETIC NEURALGIA" .
This can produce exiquisitely tender rash,and vesicular pustules/papules.This arises due to reactivation of viruses after an episodes of a febrile illness.
I strongly recommend you to take antiviral drugs -valacyclovir PLUS pregabalin
. This will resolve all the rash with adequate control of pain.
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Wish you good health,