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Herpes is a viral infection
caused by same virus which causes chicken pox
.There is another viral herpes called herpes simplex
.Normally the pox virus remains dormant in spine
for years which when triggered by some factor produces herpes.It is a self limiting disease and other than few antiviral the treatment is mostly symptomatic & the disease subsides in 10-15 days.In any case of further queries you can ask again by posting your question.