I have shingles on right buttock extending to anus and perineum. Have been on Valtrex for a week, but still very painful in one spot near rectum. Now I am getting considerable skin sensitivity on right side of chest. Could the shingles be spreading to the chest after this long a time? Also, my doctor said to use polysporin to ward off any infection. I use this plus lidocane ointment. Any other suggestions? Please advise regarding skin sensitivity in dermatome other than sacral.