HPV??

My boyfriend (for the past 10 years) has what looks like a "plantar wart" on the bottom of his foot. From what I read online (I know, big no no) it says it's caused from HPV. We're both 21 & have been sexually active for the past two years. I've been std tested since then with completely clean results, but after reading that it was caused by HPV, I've been extremely worried. So I called the drs office & the lady said she has never heard of HPV causing warts & that it seemed normal. So my question is, am I freaking out for nothing or is what I read online true??? I probably sound like a hypochondriac but..
Ladies, please help!