hi. is it possible to have shingles and not blisters or leasons.i have a small rash on my abdoman but this has been there for more years than i care to remember, but not all my life that i do know. i have a point on my lower back , to the left thats very sensitive at times, but not all the time.pain in my left leg, all the time, to the left of the knee cap and below is worse , numbness up and down the left leg, pulses of pain occasionally if i walk for any length of time, my left foot is totally numb. i cannot sleep the pain is so great , i wake after just 4 hrs, and i have to get out of bed. would a blood test tell if i have shingles?