No: These are common. Often the trigger is unknown. The most common is sun damage [UV]. Also provoked by fever or by minor injury to the area. Best therapy for occasional attacks is Valacyclovir 2G taken immediately at first tingling [prodrome] of next attack. It is a prescription but entirely safe. If not treated the first day, any treatment is a waste of money. Will heal in about a week anyway.
Answered 1/25/2016
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