Razor burn or something else?

For about 6 years now I've been getting these random open cuts,sores,& puss filled bumps that come & go on their own,on my pubic area.I am NOT sexually active at all,so I don't think it can be an STD.I used to shave with a razor,but it's been about a year or so since I've done that.I now use electric ones instead of blades.My underwear tends to stick to the sores (which hurts when I take them off) & leaves behind blood stains on them.Could it be my underwear,tight clothing,or the lasting effects of shaving causing this?