I don't know why but it deleted my first post, which said I had 1 mole on my thigh my whole life, which very slowly started to grow sometime not directly after my first sexual encounter. 2 doctors said it was absolutely nothing... Then they cut it off and biopsied it (which is the only test for hpv, so her std test doesn't matter) and told me I have hpv.
I should also say, that the growing it did was slow and over a few years and never grew A lot, so I wasn't too worried at first. I was drinking and making poor diet choices which help the virus grow, I changed all that now and have lots of hope, if that is what you have, 80% of people have had it and ther is a lot of info out there
Best to see your doctor about your concerns
Does not sound like any std I've heard of. Maybe molluscum but that is extremely contagious and your girlfriend would be affected as well.