What is this bump and could it cancerous or possibly herpes? (Photos)

Hello- I have a red, painful, oval shaped bump right along the line where my underwear or a bikini would fall. I've had ingrowns a lot in the past but this isn't going away and I can't find a root. It's painful because it rubs my clothes and I'm also noticing a faint smell. Had a Pap smear and urine test while it was there last week and came back clear but wondering if a blood test for herpes is necessary or if it could even be something skin cancer related as I have a history . Thanks!