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. If the lumps persist then it will be best to get it evaluated from a
dermatologist. I hope it helps. Take care and regards.