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Warts vary in appearance depending on where they are on the body and how thick the skin is. They can develop in isolation or in clusters and are non-cancerous.
Some warts are more likely to affect particular areas of the body. For example, verrucas are warts that usually develop on the soles of the feet.
Most people will have warts at some point in their life. They tend to affect children and teenagers more than adults.
Source: NHS choices