They will use liquid nitrogen to freeze the wart off; just be aware that it may take several applications.

Liquid nitrogen is kept within insulated containers and has to be handled with care. It is used in medical environments such as cryotherapy to remove unwanted skin, such as warts, moles ...

There are plenty of ‘wart clinics’ ready to freeze your wart or verruca with liquid nitrogen – but this can damage the surrounding skin and the evidence for its effectiveness turns out to be ...