Warts are growths on your skin caused by an infection with humanpapilloma virus, or HPV.  Types of warts include 
Common warts, which often appear on your fingers 
Plantar warts, which show up on the soles of your feet 
Genital warts, which are a sexually transmitted disease 
Flat warts, which appear in places you shave frequently 
 
In children, warts often go away on their own. In adults, they tend to stay. If they hurt or bother you, or if they multiply, you can remove them. Chemical skin treatments usually work. If not, various freezing, surgical and laser treatments can remove warts.