Hi, thanks for using healthcare magic
It is possible from your description that the rash
is a herpes rash however accurate diagnosis would require that the STD testing be repeated.
is normally associated with painful lesions. It usual starts as redness
or a discomfort in the area, this progresses to small blisters which eventually ulcerate.
The rash would normally resolve on its own but the use of antiviral medication
may speed up recovery.
i hope this helps