If you have noticed something strange on the bottom of your foot, it may be that you have a verruca. A verruca is something that is caused by a virus known as HPV or Human Papilloma virus, and this can live a long time on surfaces, which is why verrucas are so contagious.
One of the most common places where you can catch a verruca is in a gym or swimming pool changing room as this is where the virus can live and of course can be easily transferred via the bare feet that come into contact with the floor, as well as the fact that warm damp environments are the perfect place for the HPV to thrive.
If you think that you have a verruca, your best bet is to go to see a professional that specialises in foot health like this podiatrist Evesham based company https://www.propodiatry.co.uk/podiatry/podiatrist-evesham who will be able to advise you on the best course of action to treat it.
Something that is often mistaken for a verruca is a corn, and this is an entirely different thing, although it can look similar. A corn is an area of hard skin caused by pressure on the foot and has nothing to do with a viral infection like a verruca.
Sometimes a verruca will go away on its own if it is left, but if you have had it for some time then it is best to seek treatment for it as it can become painful.