Warts on fingers are small, grainy skin growths that occur most often on the fingers or hands. They are caused by the human papillomavirus (HPV), which is quite common and has more than 150 types, but only a few cause warts on the hands. The virus enters through small cuts in the skin and causes an overgrowth of cells, making the outer layer of the skin turn thick and hard, and a raised, dome-shaped wart eventually forms. Warts are not considered very contagious, but they can be caught by close skin-to-skin contact or indirectly from contaminated objects or surfaces. Some people are more prone to warts than others, and the viruses are more likely to cause warts when they come in contact with skin that is damaged or cut. Warts on fingers are usually harmless and eventually disappear on their own, but many people choose to remove them because they find them bothersome or embarrassing.