A wart is a growth in the skin caused by a viral infection. Verrucas / Warts tend to be hard and flat with elevated, rough surfaces with well-defined boundaries. Some have one or more black pinpoints. They are frequently called plantar warts because they appear on the plantar surface, or sole of the foot. Children, especially teenagers, tend to be more susceptible to warts than adults, also people with deficient immune systems.
It is possible that a variety of other more serious lesions, including carcinomas and melanomas (cancers), can be mistakenly identified as warts. Because of those identification problems, it is wise to consult a Foot Health Practitioner about any suspicious growth or eruption on the skin of the feet. If warts are left untreated, they can grow and spread into clusters of several warts.