Call your doctor if:
You suspect an outbreak is beginning. If you take antiviral drugs in the early stages, you may shorten the course of the infection.
You have the rash on your face, especially on the nose. This puts you at risk of herpes zoster in the eye, which can lead to corneal damage and vision problems.
The affected area becomes secondarily infected with bacteria (indicated by spreading redness, swelling, a high fever, and pus); antibiotics can help halt the spread of bacterial infection but not the shingles itself.
Your rash lasts longer than 10 days without improvement.
The pain becomes too great to bear; your doctor may prescribe stronger painkillers or a nerve blocker.
You have shingles and are in contact with someone who has a weakened immune system.
You develop any strange symptoms with the shingles rash, such as vertigo, buzzing in your ears, rapid onset weakness, double vision, face droop, or confusion.