AAFM Boards Dermatology Practice Test

Plantar warts are primarily caused by a viral infection, specifically the human papillomavirus (HPV). This virus infects the top layer of skin, particularly when there are breaks or injuries that allow entry. The virus thrives in warm and moist environments, like swimming pools and communal showers, making these places common sources for the transmission of the HPV that leads to plantar warts.

The presence of the virus triggers the excessive growth of skin cells, resulting in the characteristic raised, rough appearance of warts. Unlike other conditions, such as fungal infections which are caused by organisms and present different symptoms, or excessive sweating and genetic factors that may influence skin conditions but do not directly cause plantar warts, the root cause remains firmly linked to the viral origin of the HPV. This understanding is essential for effective prevention and management strategies for those susceptible to plantar warts.