Warts are small lumps that often develop on the skin of the hands and feet. Warts vary in appearance and may develop singly or in clusters. Some are more likely to affect particular areas of the body. For example, verrucas are warts that usually develop on the soles of the feet. Warts are non-cancerous, but can resemble certain cancers. Most people will have warts at some point in their life. They tend to affect children and teenagers more than adults.