Thanks for posting your query.
With the available described symptoms, there appears to be high chance of herpes zoster
caused by "Varicella
This virus is also responsible for causing chicken pox
in childhood and at times during adult age.
You should consult with dermatologist/ internal medicine specialist and should go for thorough check up.
These viral infection has life span of 3-5 days and during this period, lesions starts recovering with formation of scab.
At times, pain may persist even after all measures.
She should take antiviral medication
and apply antiviral ointment along with steroids
As such no precaution is required as the virus remains in dormant condition in nerve fibres.
Dr. Mayank Bhargava