a steange neck rash developed at base at front left hand side. rectangular almost in shape. very dry but not really itchy. began to spread around neck before disappearing.
at same time as rash began to go, acute pain in left hand side of torso, roughly kidney area around to front.
associated with ice pick type headaches.
symptoms abated after 3-4 days with no treatment but pain has returned twice more for short periods
all bloods fine. no blood in urine
any ideas on diagnosis