Irritation/pimples In Pubic Hair Region Only

I am almost 20. I just noticed today a group of small pimples/irritation on my groin Only, which kind of resembles the pimples one would get after shaving too close; but i have pubic hair and have not shaved in a month or so. I had unprotected sex about a day / day and a half ago with a girl. She had very sharp and spikey several-day-old pubic stubble, and because of the positions, there was intense grinding/friction of our groin regions. From what i've gatherd, it seems most likely to be just a rash/irritation area from friction, or a molluscum(?)infection, or, unlikely but possibly scabies? If you have seen this before or have any light you can shed, please let me know, thanks