Common warts are small, grainy skin growths that occur most often on your fingers or hands. Rough to the touch, common warts also often feature a pattern of tiny black dots, which are small, clotted blood vessels.
Common warts are caused by a virus and are transmitted by touch. It can take a wart as long as two to six months to develop after your skin has been exposed to the virus. Common warts are usually harmless and eventually disappear on their own. But many people choose to remove them because they find them bothersome or embarrassing.
Common warts usually occur on your fingers or hands and may be:
- Small, fleshy, grainy bumps
- Flesh-colored, white, pink or tan
- Rough to the touch
- Sprinkled with black pinpoints, which are small, clotted blood vessels
Common warts are caused by the human papillomavirus (HPV). The virus is quite common and has more than 150 types, but only a few cause warts on your hands. Some strains of HPV are acquired through sexual contact. Most forms, however, are spread by casual skin contact or through shared objects, such as towels or washcloths. The virus usually spreads through breaks in your skin, such as a hangnail or a scrape. Biting your nails also can cause warts to spread on your fingertips and around your nails.
Each person's immune system responds to the HPV virus differently, so not everyone who comes in contact with HPV develops warts.
People at higher risk of developing common warts include:
- Children and young adults, because their bodies may not have built up immunity to the virus
- People with weakened immune systems, such as those with HIV/AIDS or people who've had organ transplants
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