The underlying cause of warts are some HPV strains. The risk factors are those that facilitate the rooting of these virus strains: first of all, the contagion by direct contact with the warts of others or with their own warts (process known as “autoinoculation”, through which warts they are transmitted from one part of the body to the other).
Other risk factors are:
- the presence of skin lesions that facilitate the entry of viruses (a healthy, well-hydrated and wound-free skin is more resistant to viral attack);
- the weakening of the immune defenses;
- the promiscuous use of towels, bathrobes and nail care items.
Generally these infections appear as small outgrowths characterized by an irregular and rough surface to the touch, variable size and round shape. They mainly appear on the backs of the hands and fingers and in the nail contour. They can cause pain if they are under pressure.