Read about Verrucas here 

Quoting from the article above:

The majority of dermatologists, skin specialists, are not in favour of treating plantar warts.  Many feel that because the virus is so widespread, it could be beneficial to spread it as much as possible and as early as possible in the lives of children.

The use of devices, such as plastic socks, to protect the feet should be discouraged. As with elasticated knee bandages, the socks have limited value other than of attracting attention.  The use of a waterproof plaster is sufficient.

Most enlightened associations and professional bodies believe the exclusion of children with plantar warts from barefoot activities - such as swimming, physical education, dancing or communal showering - is no longer justified.

Where there is no firmly laid down policy with regard to verrucas (plantar warts) it is suggested that a practice of ‘masterly inactivity’ be adopted, unless painful.  Treatment then should be under strict medical advice.