I have had this and an identical one on other foot for about 2 years. Had thought it was a verruca and was treating as such (on and off!) But now I'm starting to wonder if it is a corn or callus. I first noticed them after moving house and finding that my feet were hurting walking on the hard floors and also in some sandals that I wore throughout the summer which had quite hard flat leather soles to them. Does anyone know if it is a verruca or a corn/callus and how should I treat??