Hello,
Without examination,confirmation of a diagnosis is tough but it can be contact dermatitis,rash due to friction
rub,folliculitis,cysts ,Fordyce spots,molluscum contagiosum(multiple, small, dome-shaped papules, often with a central depression or plug) or genital warts.
Apply warm compresses,Neosporin ointment and calamine lotion and avoid messing with it.You can take anti-inflammatory pain killers like ibuprofen or acetaminophen.