Causes
Warts can be caused by 70 different strains of HPV. These viruses exist
naturally on human skin, so when a person's immune system is weak (i.e., from
illness or medications) he or she is at a higher risk of contracting the virus.
Common, plantar, or plane warts can be acquired through something as simple
as a cut. Walking barefoot in public areas is also a high-risk activity for
contracting warts. Genital warts are more serious and also the most contagious.
They are transmitted through direct sexual contact and may take from one to
six months to appear.