Under the foot, the wart is a hard sometimes painful lump, often with multiple black specks in the centre; usually only found on pressure points on the sole of the feet. These warts are cone-shaped and often covered by callus and typically very persistent.
Warts are prevalent amongst 20% of the general population, with prevalence peaking to 25-30% between the age of 11 and 12*.
Warts are caused by the human papilloma virus (HPV). There are about 130 known types of human papilloma viruses. HPV infects the top skin layer, but each HPV type is typically only able to infect a few specific areas on the body. Many HPV types can produce a benign growth, often called a "papilloma", in the area they infect. Common warts are typically caused by HPV types 2 and 4; warts by HPV type 1.
*Source : Publication Huisarts & Wetenschap, February 2010
There are various wart treatment products on the market. These typically split into acid treatments and cryo-therapy. Acid treatments (salicylic acid, formic acid or trichloroacetic acid, TCA) are based on a gradual eradification of the wart. Cryotherapy is a freezing technology causing necrosis of the wart tissue, leading to the wart dropping off after new skin has formed underneath.