Verruca – (Plantar wart).
Verruca/e are a skin condition very commonly seen on the feet. More commonly known as a plantar wart (plantar, meaning bottom of foot) these growths are viral in nature. They are caused by the human papillomavirus (HPV). The virus is everywhere which may explain why warts affect about 9 million Americans every year. They are considered benign tumors. The lesions generally occur spontaneously, but many times can be seen in areas of trauma such as after stepping on something that penetrates the skin thus creating an opening for the virus to manifest itself. Depending on where they are located on the foot, they can be painful. More often than not if left untreated they will spread, but they are also known to spontaneously disappear as well.
Some images of verruca/e.