Could this rash be herpes?

[Joe45421]

I developed a very red and itchy rash over my entire pubic area overnight after having sex with someone I had just met. I have had folliculitis so its hard to tell if any new pimple like bumps have formed. Mostly the red irritated areas just have raised welts similar to when I get an allergic reaction to something. The rash even spreads around my waste toward my rear. I have very sensitive skin and I had hoped the rash was just from the rubbing of our pubic air and I simply put hydrocortisone on it to reduce the itching. Two days have gone by and the rash has not subsided and still itches. Is this herpes or some other STD?

[Joe45421]

In the time since I posted the question a few small pimple like bumps have formed and the redness has gotten darker and more concentrated. I popped one of the small pimples since I read that herpes blisters bleed when popped and the pimple didnt bleed so Im hoping its a positive sign. I took an antihistamine which helped with itchiness but not with the redness

[Fleetwood20]

Herpes would not appear so quickly and probably not as a widespread rash as you describe. When you say welts though, do you mean red rash with raised bumps like a mosquito bite? No fluid or anything inside?

If that's the case, it sounds like an immune allergic reaction, try some antihistamine tablets and see what happens. Of course follow up with a doctor when you can.