 [ Symptoms ] can shingles flare back up once you finish antiviral medications i was diagnosed with shingles on my scalp on sept 27 2015 i was prescribed famciclovir 500 mg 3x daily i just finished the medication on oct 2 2015 and i have noticed that there seems to be new areas on my scalp that are beginning to itch and new blisters when scratched   brings me out of my skin so to speak could another dose of famciclovir be helpful or needed [ Disease ] herpes zoster can definitely come back but i am concerned about the accuracy of your diagnosis so i would strongly suggest that you see a dermatologist for an expert second opinion before just taking the medications again