A wart (also known as a verruca when a plantar wart occurs on the sole of the feet or on toes) is generally a small, rough tumor, typically on hands and feet but often other locations, that can resemble a cauliflower or a solid blister. These warts are common, and are caused by a viral infection, specifically by human papillomavirus 2 and 7. There are as many as 10 varieties of warts with the most common being considered largely harmless.
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wart A small, rough tumor, typically on hands and feet, that can resemble a cauliflower or a solid blister.