-Thought I had one on the sole of my foot. I went to the Podiatrist who diagnosed it as a callous, probably developed as a result of a change in my gate gait. So now I'm using a pumice stone to reduce its size, rubbing Vaseline into the area to soften it and occasionally a corn pad to relieve the pressure on it. It seems to be getting better.
It was a relief to know that it was not a plantar wart, which is human papillomavirus (HPV). While it is not highly contagious, it thrives in environments such a locker room and shower floors.