Hello,
Without examination,confirmation of a diagnosis is tough but it can be contact dermatitis,rash due to friction rub,folliculitis,cysts ,molluscum
depression or plug) or genital warts(caused by HPV infection). This could be due to trauma which could have caused breakage of capillaries lying just below the surface. Do not cause any further injury till the lesion has healed, which should take about 5-7 days.
Apply warm compresses,Neosporin ointment and calamine lotion and avoid messing with it.You can take anti-inflammatory pain killers like ibuprofen