It can be considered folliculitis or just normal razor bumps, considering that you mention of shaving within the pubic region once a month. Nothing serious about it but usually they run their own course and clear up within a few days or weeks or you can either go to the clinic and get prescribed topical ointment if it happens to be severe. Otherwise, you can topical ointment from CVS or Walgreens or any general convenience store near you that supplies health orientated products that treats razor bumps.