Plantar Warts: Causes, Spread & Why They're Hard to Treat
Plantar warts, also known as verrucae pedis, are a common viral skin condition that affects the soles of the feet. They are caused by infection with the Human Papilloma Virus (HPV) and can be persistent due to the way the virus interacts with the skin and avoids detection by the immune system.
Plantar warts develop when HPV enters through a compromised skin barrier. There are more than 150 known strains of HPV, however warts on the feet are most commonly associated with a smaller group, including strains 1, 2, 3, 4, 10, 27, 29, 57 and 60. Different strains can respond differently to treatment, which helps explain why some plantar warts resolve quickly while others persist.
HPV infections of the skin are common and often go unnoticed initially as the incubation period can be up to 12 months after exposure. For a general overview of how HPV causes warts, WebMD provides a helpful explanation of the different types of warts, along with the treatments you could seek.
Yes, plantar warts are contagious and can spread through:
Skin that is overly moist or dry and cracked is more vulnerable to infection, as the skin barrier is weakened. The American Academy of Dermatology notes that HPV causes plantar warts by infecting the skin through microscopic breaks, where the virus can establish itself in the outer skin layers.
It’s also important to note that infection can occur long before symptoms appear. The incubation period for plantar warts may last several months and in some cases up to a year, before a wart becomes visible.
Plantar warts form in the outer layer of the skin, known as the epidermis. This layer has slow cell turnover and limited immune surveillance, allowing HPV to establish itself with minimal resistance.
HPV is particularly difficult for the body to detect because it does not trigger a strong immune response and replicates at a rate similar to normal skin cells. This means the virus does not appear abnormal to the immune system.
Because plantar warts can vary depending on the viral strain involved and how long the infection has been present, assessment by a podiatrist can help confirm the diagnosis and guide appropriate treatment options, particularly if the wart is painful, spreading or not responding to home care.
Plantar warts can be difficult to resolve without targeted care. If your wart is painful, spreading or not improving, booking a podiatry appointment can help address the issue and prevent further spread.
If you’re unsure about a lesion on your foot or struggling with a stubborn plantar wart, book in with us now at Merewether Podiatry or New Lambton Podiatry and let our podiatrists guide you through your treatment options.
