Animals carry other types of virus. Most warts will disappear over time. The incubation period for the wart virus can be from 2 weeks to several months making it difficult to determine where it came from. The more warts a person has the more infectious they become, Warts can be successfully removed. Genital warts can be prevented.
Common warts are clusters of effected cells.
Most are round and raise above the skins surface. Once a person has contacted warts, generally more are introduced to other sites on the body accidentally or unconsciously by scratching or abraising the wart then introducing it to another site on the body. This process is called 'autoinoculation'. Common warts posses little potential for health problems unless they bleed, change color or shape. Most are removed for cosmetic purposes or because location on the body cause irritation due to rubbing on clothing, etc.