What are Warts?

Warts are a common viral infection caused by the Human Papilloma Virus (HPV). HPV has over 75 known subtypes-three of which have been implicated as causative agents in the "plantar wart" (medical term: verruca plantaris). Plantar warts are named for the location they are found, the bottom (plantar surface) of the foot. HPV has an incubation period ranging from 4 weeks to 20 months [1]. It thrives in warm, moist environments and is spread through direct contact of the skin with a contaminated surface. The virus enters the skin through small, often invisible breaks or cracks on the skin surface. Walking barefoot in a public shower is the most commonly cited example, but HPV can be contracted almost anywhere [2]. Some lucky individuals are immune to HPV infection, while less fortunate others are plagued with recurrences of the same infection.

Warts affect about 7% of Americans each year [3]. Although warts can occur at any age, HPV has a strong predilection for teenagers. Excess moisture from sweat can macerate (soften) the skin making it easier for the virus to penetrate and settle. Thus, having sweaty feet, often linked to the increased activity of adolescence, contributes to the problem. Furthermore, adolescents are frequently exposed to public locker rooms and showers at schools and camps-ideal sites to contract HPV.