A sign of this infection from the virus that also causes chicken pox is a blistering rash preceded by severe pain
The virus causes a blistering, chicken pox-like rash in a single nerve 
root ... Often the arrival of the rash is preceded by burning, itching or pain in the 
area,... [DOC] [TLE] Bacterial and Viral Rashes - eMedicineHealth [PAR] May 24, 2006 ... A virus called varicella-zoster causes this very contagious disease.