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