Thanks for asking,
The condition you described is most probably HERPES ZOSTER
,which is typically present as blisters with burning,pain,one sided of body and run for 2-3 weeks in course.you start taking acyclovir
tab 800mg 5 times a day for 1week. Tab voren 50 mg bid , and apply lignocaine gel tid. Let me know after 1week.
Thanks and bye.