I've noticed that if I irritate an area over and over (like after I ride my
bike, so pressure in genital/area or area of buttocks, and even on the palms
of BOTH hands from holding the handlebars), or if I use the computer too
long in an unusal position so I put pressure on my arm, that I get
sensations of OB in those areas.  Even if I sit in the car for a long period
of time, I'll get the same sensation in my buttocks.  Yeah, it's weird.  So,
basically, although I generally only break out in two areas (palm of hand
and genitals), I will get  prodromal symptoms ALL OVER MY BODY.  I feel the
pain, tingling and all sorts of other (very uncomfortable) sensations
throughout my body, even in my head !!! and IN my stomach!!!  and it's
always right before an OB.
My doctors refuse to believe that the herpes has gone "systemic", but that's
what I believe...that it resides in my spinal column and travels around my
body looking for the easiest exit.
Just MHO, but I've had it over 30 years, so I'm probably right.
MamaZ