The progression generally is from red bump to clear fluid-filled blister then to ulceration and saabbing. Third, as you seem to know, the initial
infection with HSV usually is associated with lymph node inflammation in the groin and often with fever, headache, etc.
So my bet is that the culture/swab tests will be negative. If so, and if your clinician believes herpes is a reasonable possibility, you could have a blood test in a few weeks.