I've had a verruca for several years. It's a form of wart, but on the foot it treads into the foot rather than being a bump. They said they did not want to attack it with scalpel or chemical & expect it to go eventually.
I had a couple of vercus on my heel for a good 3-4 years now theres no black spot though but the podiatry said they are going to leave them as they will evenually go by there self. They also said if it has a black spot that is the root of the veruca so its not that deep under the skin.